diff --git a/libraries/plugins/AuthenticationPlugin.class.php b/libraries/plugins/AuthenticationPlugin.class.php
index 8b69470f9a..3ddf55ee20 100644
--- a/libraries/plugins/AuthenticationPlugin.class.php
+++ b/libraries/plugins/AuthenticationPlugin.class.php
@@ -10,7 +10,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* This class extends the PluginObserver class */
-require_once "PluginObserver.class.php";
+require_once 'PluginObserver.class.php';
 
 /**
  * Provides a common interface that will have to be implemented by all of the
diff --git a/libraries/plugins/ExportPlugin.class.php b/libraries/plugins/ExportPlugin.class.php
index cd5bc95fbe..0af20d3c28 100644
--- a/libraries/plugins/ExportPlugin.class.php
+++ b/libraries/plugins/ExportPlugin.class.php
@@ -10,7 +10,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* This class extends the PluginObserver class */
-require_once "PluginObserver.class.php";
+require_once 'PluginObserver.class.php';
 
 /**
  * Provides a common interface that will have to be implemented by all of the
diff --git a/libraries/plugins/ImportPlugin.class.php b/libraries/plugins/ImportPlugin.class.php
index 142aad252e..0890dcf53b 100644
--- a/libraries/plugins/ImportPlugin.class.php
+++ b/libraries/plugins/ImportPlugin.class.php
@@ -10,7 +10,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* This class extends the PluginObserver class */
-require_once "PluginObserver.class.php";
+require_once 'PluginObserver.class.php';
 
 /**
  * Provides a common interface that will have to be implemented by all of the
diff --git a/libraries/plugins/PluginObserver.class.php b/libraries/plugins/PluginObserver.class.php
index fe7e7d8ba2..520d62a4d3 100644
--- a/libraries/plugins/PluginObserver.class.php
+++ b/libraries/plugins/PluginObserver.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Each PluginObserver instance contains a PluginManager instance */
-require_once "PluginManager.class.php";
+require_once 'PluginManager.class.php';
 
 /**
  * This class implements the SplObserver interface
diff --git a/libraries/plugins/TransformationsPlugin.class.php b/libraries/plugins/TransformationsPlugin.class.php
index 5fec98e51a..412a1758d4 100644
--- a/libraries/plugins/TransformationsPlugin.class.php
+++ b/libraries/plugins/TransformationsPlugin.class.php
@@ -10,9 +10,9 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* It extends the PluginObserver abstract class */
-require_once "PluginObserver.class.php";
+require_once 'PluginObserver.class.php';
 /* It also implements the transformations interface */
-require_once "TransformationsInterface.int.php";
+require_once 'TransformationsInterface.int.php';
 
 /**
  * Extends PluginObserver and provides a common interface that will have to
diff --git a/libraries/plugins/auth/AuthenticationConfig.class.php b/libraries/plugins/auth/AuthenticationConfig.class.php
index e67290c711..fb4ca57464 100644
--- a/libraries/plugins/auth/AuthenticationConfig.class.php
+++ b/libraries/plugins/auth/AuthenticationConfig.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the authentication interface */
-require_once "libraries/plugins/AuthenticationPlugin.class.php";
+require_once 'libraries/plugins/AuthenticationPlugin.class.php';
 
 /**
  * Handles the config authentication method
diff --git a/libraries/plugins/auth/AuthenticationCookie.class.php b/libraries/plugins/auth/AuthenticationCookie.class.php
index dd32018cee..40fa6512cb 100644
--- a/libraries/plugins/auth/AuthenticationCookie.class.php
+++ b/libraries/plugins/auth/AuthenticationCookie.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the authentication interface */
-require_once "libraries/plugins/AuthenticationPlugin.class.php";
+require_once 'libraries/plugins/AuthenticationPlugin.class.php';
 
 /**
  * Remember where to redirect the user
diff --git a/libraries/plugins/auth/AuthenticationHttp.class.php b/libraries/plugins/auth/AuthenticationHttp.class.php
index 89eeab9a5f..4046f9528f 100644
--- a/libraries/plugins/auth/AuthenticationHttp.class.php
+++ b/libraries/plugins/auth/AuthenticationHttp.class.php
@@ -12,7 +12,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the authentication interface */
-require_once "libraries/plugins/AuthenticationPlugin.class.php";
+require_once 'libraries/plugins/AuthenticationPlugin.class.php';
 
 /**
  * Handles the HTTP authentication methods
diff --git a/libraries/plugins/auth/AuthenticationSignon.class.php b/libraries/plugins/auth/AuthenticationSignon.class.php
index 0f5138db28..ee1cf364b7 100644
--- a/libraries/plugins/auth/AuthenticationSignon.class.php
+++ b/libraries/plugins/auth/AuthenticationSignon.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the authentication interface */
-require_once "libraries/plugins/AuthenticationPlugin.class.php";
+require_once 'libraries/plugins/AuthenticationPlugin.class.php';
 
 /**
  * Handles the SignOn authentication method
diff --git a/libraries/plugins/export/ExportCodegen.class.php b/libraries/plugins/export/ExportCodegen.class.php
index 3494ee8157..87a75812a0 100644
--- a/libraries/plugins/export/ExportCodegen.class.php
+++ b/libraries/plugins/export/ExportCodegen.class.php
@@ -11,9 +11,9 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the export interface */
-require_once "libraries/plugins/ExportPlugin.class.php";
+require_once 'libraries/plugins/ExportPlugin.class.php';
 /* Get the table property class */
-require_once "libraries/plugins/export/TableProperty.class.php";
+require_once 'libraries/plugins/export/TableProperty.class.php';
 
 /**
  * Handles the export for the CodeGen class
diff --git a/libraries/plugins/export/ExportCsv.class.php b/libraries/plugins/export/ExportCsv.class.php
index 93505e0c1f..5c25503603 100644
--- a/libraries/plugins/export/ExportCsv.class.php
+++ b/libraries/plugins/export/ExportCsv.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the export interface */
-require_once "libraries/plugins/ExportPlugin.class.php";
+require_once 'libraries/plugins/ExportPlugin.class.php';
 
 /**
  * Handles the export for the CSV format
diff --git a/libraries/plugins/export/ExportExcel.class.php b/libraries/plugins/export/ExportExcel.class.php
index 3ddf6b6110..7217d6ded3 100644
--- a/libraries/plugins/export/ExportExcel.class.php
+++ b/libraries/plugins/export/ExportExcel.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Extend the export CSV class */
-require_once "libraries/plugins/export/ExportCsv.class.php";
+require_once 'libraries/plugins/export/ExportCsv.class.php';
 
 /**
  * Handles the export for the CSV-Excel format
diff --git a/libraries/plugins/export/ExportHtmlword.class.php b/libraries/plugins/export/ExportHtmlword.class.php
index 6297692e49..55afa2afff 100644
--- a/libraries/plugins/export/ExportHtmlword.class.php
+++ b/libraries/plugins/export/ExportHtmlword.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the export interface */
-require_once "libraries/plugins/ExportPlugin.class.php";
+require_once 'libraries/plugins/ExportPlugin.class.php';
 
 /**
  * Handles the export for the HTML-Word format
diff --git a/libraries/plugins/export/ExportJson.class.php b/libraries/plugins/export/ExportJson.class.php
index 203ced9ac9..1c41206973 100644
--- a/libraries/plugins/export/ExportJson.class.php
+++ b/libraries/plugins/export/ExportJson.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the export interface */
-require_once "libraries/plugins/ExportPlugin.class.php";
+require_once 'libraries/plugins/ExportPlugin.class.php';
 
 /**
  * Handles the export for the JSON format
diff --git a/libraries/plugins/export/ExportLatex.class.php b/libraries/plugins/export/ExportLatex.class.php
index 6077838114..09b6f84bbc 100644
--- a/libraries/plugins/export/ExportLatex.class.php
+++ b/libraries/plugins/export/ExportLatex.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the export interface */
-require_once "libraries/plugins/ExportPlugin.class.php";
+require_once 'libraries/plugins/ExportPlugin.class.php';
 
 /**
  * Handles the export for the Latex format
diff --git a/libraries/plugins/export/ExportMediawiki.class.php b/libraries/plugins/export/ExportMediawiki.class.php
index 0803c7d28f..2ee4acf098 100644
--- a/libraries/plugins/export/ExportMediawiki.class.php
+++ b/libraries/plugins/export/ExportMediawiki.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the export interface */
-require_once "libraries/plugins/ExportPlugin.class.php";
+require_once 'libraries/plugins/ExportPlugin.class.php';
 
 /**
  * Handles the export for the MediaWiki class
diff --git a/libraries/plugins/export/ExportOds.class.php b/libraries/plugins/export/ExportOds.class.php
index 3a0e603cca..cfa7cbabee 100644
--- a/libraries/plugins/export/ExportOds.class.php
+++ b/libraries/plugins/export/ExportOds.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the export interface */
-require_once "libraries/plugins/ExportPlugin.class.php";
+require_once 'libraries/plugins/ExportPlugin.class.php';
 
 $GLOBALS['ods_buffer'] = '';
 require_once 'libraries/opendocument.lib.php';
diff --git a/libraries/plugins/export/ExportOdt.class.php b/libraries/plugins/export/ExportOdt.class.php
index 5b0a9e5eee..26bda0c78c 100644
--- a/libraries/plugins/export/ExportOdt.class.php
+++ b/libraries/plugins/export/ExportOdt.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the export interface */
-require_once "libraries/plugins/ExportPlugin.class.php";
+require_once 'libraries/plugins/ExportPlugin.class.php';
 
 $GLOBALS['odt_buffer'] = '';
 require_once 'libraries/opendocument.lib.php';
diff --git a/libraries/plugins/export/ExportPdf.class.php b/libraries/plugins/export/ExportPdf.class.php
index 996de3c232..ed40ca9ecc 100644
--- a/libraries/plugins/export/ExportPdf.class.php
+++ b/libraries/plugins/export/ExportPdf.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the export interface */
-require_once "libraries/plugins/ExportPlugin.class.php";
+require_once 'libraries/plugins/ExportPlugin.class.php';
 /* Get the PMA_ExportPdf class */
 require_once 'libraries/plugins/export/PMA_ExportPdf.class.php';
 
diff --git a/libraries/plugins/export/ExportPhparray.class.php b/libraries/plugins/export/ExportPhparray.class.php
index e11432cf3c..3208121262 100644
--- a/libraries/plugins/export/ExportPhparray.class.php
+++ b/libraries/plugins/export/ExportPhparray.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the export interface */
-require_once "libraries/plugins/ExportPlugin.class.php";
+require_once 'libraries/plugins/ExportPlugin.class.php';
 
 /**
  * Handles the export for the PHP Array class
diff --git a/libraries/plugins/export/ExportSql.class.php b/libraries/plugins/export/ExportSql.class.php
index 831a72092b..6315c17ca6 100644
--- a/libraries/plugins/export/ExportSql.class.php
+++ b/libraries/plugins/export/ExportSql.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the export interface */
-require_once "libraries/plugins/ExportPlugin.class.php";
+require_once 'libraries/plugins/ExportPlugin.class.php';
 
 /**
  * Handles the export for the SQL class
diff --git a/libraries/plugins/export/ExportTexytext.class.php b/libraries/plugins/export/ExportTexytext.class.php
index 12be5cc6af..f005f827fd 100644
--- a/libraries/plugins/export/ExportTexytext.class.php
+++ b/libraries/plugins/export/ExportTexytext.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the export interface */
-require_once "libraries/plugins/ExportPlugin.class.php";
+require_once 'libraries/plugins/ExportPlugin.class.php';
 
 /**
  * Handles the export for the Texy! text class
diff --git a/libraries/plugins/export/ExportXml.class.php b/libraries/plugins/export/ExportXml.class.php
index bcb2ad1bee..af0a91738b 100644
--- a/libraries/plugins/export/ExportXml.class.php
+++ b/libraries/plugins/export/ExportXml.class.php
@@ -14,7 +14,7 @@ if (! strlen($GLOBALS['db'])) { /* Can't do server export */
 }
 
 /* Get the export interface */
-require_once "libraries/plugins/ExportPlugin.class.php";
+require_once 'libraries/plugins/ExportPlugin.class.php';
 
 /**
  * Handles the export for the XML class
diff --git a/libraries/plugins/export/ExportYaml.class.php b/libraries/plugins/export/ExportYaml.class.php
index 4b3dd3bc5f..7c2585139e 100644
--- a/libraries/plugins/export/ExportYaml.class.php
+++ b/libraries/plugins/export/ExportYaml.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the export interface */
-require_once "libraries/plugins/ExportPlugin.class.php";
+require_once 'libraries/plugins/ExportPlugin.class.php';
 
 /**
  * Handles the export for the YAML format
diff --git a/libraries/plugins/export/README b/libraries/plugins/export/README
index 47d0c4fd4f..68d5a26f13 100644
--- a/libraries/plugins/export/README
+++ b/libraries/plugins/export/README
@@ -16,7 +16,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the export interface */
-require_once "libraries/plugins/ExportPlugin.class.php";
+require_once 'libraries/plugins/ExportPlugin.class.php';
 
 /**
  * Handles the export for the [Name] format
diff --git a/libraries/plugins/import/ImportCsv.class.php b/libraries/plugins/import/ImportCsv.class.php
index 27063f7819..fc202d45e7 100644
--- a/libraries/plugins/import/ImportCsv.class.php
+++ b/libraries/plugins/import/ImportCsv.class.php
@@ -12,7 +12,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the import interface */
-require_once "libraries/plugins/ImportPlugin.class.php";
+require_once 'libraries/plugins/ImportPlugin.class.php';
 
 /**
  * Handles the import for the CSV format
diff --git a/libraries/plugins/import/ImportLdi.class.php b/libraries/plugins/import/ImportLdi.class.php
index 1359deab13..fd236179b2 100644
--- a/libraries/plugins/import/ImportLdi.class.php
+++ b/libraries/plugins/import/ImportLdi.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the import interface */
-require_once "libraries/plugins/ImportPlugin.class.php";
+require_once 'libraries/plugins/ImportPlugin.class.php';
 
 // We need relations enabled and we work only on database
 if ($GLOBALS['plugin_param'] !== 'table') {
diff --git a/libraries/plugins/import/ImportMediawiki.class.php b/libraries/plugins/import/ImportMediawiki.class.php
index e6ce2e0e96..9a1500f0ac 100644
--- a/libraries/plugins/import/ImportMediawiki.class.php
+++ b/libraries/plugins/import/ImportMediawiki.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the import interface */
-require_once "libraries/plugins/ImportPlugin.class.php";
+require_once 'libraries/plugins/ImportPlugin.class.php';
 
 /**
  * Handles the import for the MediaWiki format
diff --git a/libraries/plugins/import/ImportOds.class.php b/libraries/plugins/import/ImportOds.class.php
index fc181c303f..89da1e35f0 100644
--- a/libraries/plugins/import/ImportOds.class.php
+++ b/libraries/plugins/import/ImportOds.class.php
@@ -20,7 +20,7 @@ if (!function_exists('libxml_disable_entity_loader')) {
 }
 
 /* Get the import interface */
-require_once "libraries/plugins/ImportPlugin.class.php";
+require_once 'libraries/plugins/ImportPlugin.class.php';
 
 /**
  * Handles the import for the ODS format
diff --git a/libraries/plugins/import/ImportShp.class.php b/libraries/plugins/import/ImportShp.class.php
index 5736624572..0ec378242a 100644
--- a/libraries/plugins/import/ImportShp.class.php
+++ b/libraries/plugins/import/ImportShp.class.php
@@ -16,11 +16,11 @@ if (PMA_DRIZZLE) {
 }
 
 /* Get the import interface*/
-require_once "libraries/plugins/ImportPlugin.class.php";
+require_once 'libraries/plugins/ImportPlugin.class.php';
 /* Get the ShapeFile class */
-require_once "libraries/bfShapeFiles/ShapeFile.lib.php";
-require_once "libraries/plugins/import/ShapeFile.class.php";
-require_once "libraries/plugins/import/ShapeRecord.class.php";
+require_once 'libraries/bfShapeFiles/ShapeFile.lib.php';
+require_once 'libraries/plugins/import/ShapeFile.class.php';
+require_once 'libraries/plugins/import/ShapeRecord.class.php';
 
 /**
  * Handles the import for ESRI Shape files
diff --git a/libraries/plugins/import/ImportSql.class.php b/libraries/plugins/import/ImportSql.class.php
index 0b705772dc..46e3007b01 100644
--- a/libraries/plugins/import/ImportSql.class.php
+++ b/libraries/plugins/import/ImportSql.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the import interface */
-require_once "libraries/plugins/ImportPlugin.class.php";
+require_once 'libraries/plugins/ImportPlugin.class.php';
 
 /**
  * Handles the import for the SQL format
diff --git a/libraries/plugins/import/ImportXml.class.php b/libraries/plugins/import/ImportXml.class.php
index 447f96eaba..f3199a28b1 100644
--- a/libraries/plugins/import/ImportXml.class.php
+++ b/libraries/plugins/import/ImportXml.class.php
@@ -20,7 +20,7 @@ if (!function_exists('libxml_disable_entity_loader')) {
 }
 
 /* Get the import interface */
-require_once "libraries/plugins/ImportPlugin.class.php";
+require_once 'libraries/plugins/ImportPlugin.class.php';
 
 /**
  * Handles the import for the XML format
diff --git a/libraries/plugins/import/README b/libraries/plugins/import/README
index fae847f064..76d2b07ccb 100644
--- a/libraries/plugins/import/README
+++ b/libraries/plugins/import/README
@@ -16,7 +16,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the import interface */
-require_once "libraries/plugins/ImportPlugin.class.php";
+require_once 'libraries/plugins/ImportPlugin.class.php';
 
 /**
  * Handles the import for the [Name] format
diff --git a/libraries/plugins/import/upload/UploadApc.class.php b/libraries/plugins/import/upload/UploadApc.class.php
index 7f480f6a55..881832fda1 100644
--- a/libraries/plugins/import/upload/UploadApc.class.php
+++ b/libraries/plugins/import/upload/UploadApc.class.php
@@ -10,7 +10,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the transformations interface */
-require_once "libraries/plugins/UploadInterface.int.php";
+require_once 'libraries/plugins/UploadInterface.int.php';
 
 /**
  * Implementation for the APC extension
diff --git a/libraries/plugins/import/upload/UploadNoplugin.class.php b/libraries/plugins/import/upload/UploadNoplugin.class.php
index 84453fab49..90148ded4c 100644
--- a/libraries/plugins/import/upload/UploadNoplugin.class.php
+++ b/libraries/plugins/import/upload/UploadNoplugin.class.php
@@ -10,7 +10,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the transformations interface */
-require_once "libraries/plugins/UploadInterface.int.php";
+require_once 'libraries/plugins/UploadInterface.int.php';
 
 /**
  * Implementation for no plugin
diff --git a/libraries/plugins/import/upload/UploadProgress.class.php b/libraries/plugins/import/upload/UploadProgress.class.php
index 8264c96c91..1a507763d2 100644
--- a/libraries/plugins/import/upload/UploadProgress.class.php
+++ b/libraries/plugins/import/upload/UploadProgress.class.php
@@ -10,7 +10,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the transformations interface */
-require_once "libraries/plugins/UploadInterface.int.php";
+require_once 'libraries/plugins/UploadInterface.int.php';
 
 /**
  * Implementation for upload progress
diff --git a/libraries/plugins/import/upload/UploadSession.class.php b/libraries/plugins/import/upload/UploadSession.class.php
index d2464a043a..36404133ee 100644
--- a/libraries/plugins/import/upload/UploadSession.class.php
+++ b/libraries/plugins/import/upload/UploadSession.class.php
@@ -10,7 +10,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the transformations interface */
-require_once "libraries/plugins/UploadInterface.int.php";
+require_once 'libraries/plugins/UploadInterface.int.php';
 
 /**
  * Implementation for session
diff --git a/libraries/plugins/transformations/Application_Octetstream_Download.class.php b/libraries/plugins/transformations/Application_Octetstream_Download.class.php
index e88e34386f..aa5019a93c 100644
--- a/libraries/plugins/transformations/Application_Octetstream_Download.class.php
+++ b/libraries/plugins/transformations/Application_Octetstream_Download.class.php
@@ -10,7 +10,7 @@ if (! defined('PHPMYADMIN')) {
     exit;
 }
 /* Get the download transformations interface */
-require_once "abstract/DownloadTransformationsPlugin.class.php";
+require_once 'abstract/DownloadTransformationsPlugin.class.php';
 
 /**
  * Handles the download transformation for application octetstream
diff --git a/libraries/plugins/transformations/Application_Octetstream_Hex.class.php b/libraries/plugins/transformations/Application_Octetstream_Hex.class.php
index 09c87ed74a..e6d6c2af7b 100644
--- a/libraries/plugins/transformations/Application_Octetstream_Hex.class.php
+++ b/libraries/plugins/transformations/Application_Octetstream_Hex.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the hex transformations interface */
-require_once "abstract/HexTransformationsPlugin.class.php";
+require_once 'abstract/HexTransformationsPlugin.class.php';
 
 /**
  * Handles the hex transformation for application octetstream
diff --git a/libraries/plugins/transformations/Image_JPEG_Inline.class.php b/libraries/plugins/transformations/Image_JPEG_Inline.class.php
index 5db7fe9f1e..8b09df6cfd 100644
--- a/libraries/plugins/transformations/Image_JPEG_Inline.class.php
+++ b/libraries/plugins/transformations/Image_JPEG_Inline.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the inline transformations interface */
-require_once "abstract/InlineTransformationsPlugin.class.php";
+require_once 'abstract/InlineTransformationsPlugin.class.php';
 
 /**
  * Handles the inline transformation for image jpeg
diff --git a/libraries/plugins/transformations/Image_JPEG_Link.class.php b/libraries/plugins/transformations/Image_JPEG_Link.class.php
index e2f018fd36..e55348a690 100644
--- a/libraries/plugins/transformations/Image_JPEG_Link.class.php
+++ b/libraries/plugins/transformations/Image_JPEG_Link.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the link transformations interface */
-require_once "abstract/ImageLinkTransformationsPlugin.class.php";
+require_once 'abstract/ImageLinkTransformationsPlugin.class.php';
 
 /**
  * Handles the link transformation for image jpeg
diff --git a/libraries/plugins/transformations/Image_PNG_Inline.class.php b/libraries/plugins/transformations/Image_PNG_Inline.class.php
index af60e315ee..2fac38c809 100644
--- a/libraries/plugins/transformations/Image_PNG_Inline.class.php
+++ b/libraries/plugins/transformations/Image_PNG_Inline.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the inline transformations interface */
-require_once "abstract/InlineTransformationsPlugin.class.php";
+require_once 'abstract/InlineTransformationsPlugin.class.php';
 
 /**
  * Handles the inline transformation for image png
diff --git a/libraries/plugins/transformations/TEMPLATE b/libraries/plugins/transformations/TEMPLATE
index 5668f34224..82a65ec109 100644
--- a/libraries/plugins/transformations/TEMPLATE
+++ b/libraries/plugins/transformations/TEMPLATE
@@ -13,7 +13,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the [TransformationName] transformations interface */
-require_once "abstract/[TransformationName]TransformationsPlugin.class.php";
+require_once 'abstract/[TransformationName]TransformationsPlugin.class.php';
 
 /**
  * Handles the [TransformationName] transformation for [MIMEType] - [MIMESubtype]
diff --git a/libraries/plugins/transformations/TEMPLATE_ABSTRACT b/libraries/plugins/transformations/TEMPLATE_ABSTRACT
index 68946aaa76..8c9c61cf94 100644
--- a/libraries/plugins/transformations/TEMPLATE_ABSTRACT
+++ b/libraries/plugins/transformations/TEMPLATE_ABSTRACT
@@ -13,7 +13,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the transformations interface */
-require_once "libraries/plugins/TransformationsPlugin.class.php";
+require_once 'libraries/plugins/TransformationsPlugin.class.php';
 
 /**
  * Provides common methods for all of the [TransformationName] transformations plugins.
diff --git a/libraries/plugins/transformations/Text_Plain_Append.class.php b/libraries/plugins/transformations/Text_Plain_Append.class.php
index 50072baa43..8bdf529fdd 100644
--- a/libraries/plugins/transformations/Text_Plain_Append.class.php
+++ b/libraries/plugins/transformations/Text_Plain_Append.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the append transformations interface */
-require_once "abstract/AppendTransformationsPlugin.class.php";
+require_once 'abstract/AppendTransformationsPlugin.class.php';
 
 /**
  * Handles the append transformation for text plain.
diff --git a/libraries/plugins/transformations/Text_Plain_Dateformat.class.php b/libraries/plugins/transformations/Text_Plain_Dateformat.class.php
index 3d2c912b15..234ecdb36d 100644
--- a/libraries/plugins/transformations/Text_Plain_Dateformat.class.php
+++ b/libraries/plugins/transformations/Text_Plain_Dateformat.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the date format transformations interface */
-require_once "abstract/DateFormatTransformationsPlugin.class.php";
+require_once 'abstract/DateFormatTransformationsPlugin.class.php';
 
 /**
  * Handles the date format transformation for text plain
diff --git a/libraries/plugins/transformations/Text_Plain_External.class.php b/libraries/plugins/transformations/Text_Plain_External.class.php
index 2fbc3ce4d0..11d7bb7744 100644
--- a/libraries/plugins/transformations/Text_Plain_External.class.php
+++ b/libraries/plugins/transformations/Text_Plain_External.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the external transformations interface */
-require_once "abstract/ExternalTransformationsPlugin.class.php";
+require_once 'abstract/ExternalTransformationsPlugin.class.php';
 
 /**
  * Handles the external transformation for text plain
diff --git a/libraries/plugins/transformations/Text_Plain_Formatted.class.php b/libraries/plugins/transformations/Text_Plain_Formatted.class.php
index 714d808890..83bb8dca0f 100644
--- a/libraries/plugins/transformations/Text_Plain_Formatted.class.php
+++ b/libraries/plugins/transformations/Text_Plain_Formatted.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the formatted transformations interface */
-require_once "abstract/FormattedTransformationsPlugin.class.php";
+require_once 'abstract/FormattedTransformationsPlugin.class.php';
 
 /**
  * Handles the formatted transformation for text plain
diff --git a/libraries/plugins/transformations/Text_Plain_Imagelink.class.php b/libraries/plugins/transformations/Text_Plain_Imagelink.class.php
index d9e0110afb..e56f59faf6 100644
--- a/libraries/plugins/transformations/Text_Plain_Imagelink.class.php
+++ b/libraries/plugins/transformations/Text_Plain_Imagelink.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the image link transformations interface */
-require_once "abstract/TextImageLinkTransformationsPlugin.class.php";
+require_once 'abstract/TextImageLinkTransformationsPlugin.class.php';
 
 /**
  * Handles the image link transformation for text plain
diff --git a/libraries/plugins/transformations/Text_Plain_Link.class.php b/libraries/plugins/transformations/Text_Plain_Link.class.php
index da93d3c00a..06731da123 100644
--- a/libraries/plugins/transformations/Text_Plain_Link.class.php
+++ b/libraries/plugins/transformations/Text_Plain_Link.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the link transformations interface */
-require_once "abstract/TextLinkTransformationsPlugin.class.php";
+require_once 'abstract/TextLinkTransformationsPlugin.class.php';
 
 /**
  * Handles the link transformation for text plain
diff --git a/libraries/plugins/transformations/Text_Plain_Longtoipv4.class.php b/libraries/plugins/transformations/Text_Plain_Longtoipv4.class.php
index 202b0c73bf..7f2004db99 100644
--- a/libraries/plugins/transformations/Text_Plain_Longtoipv4.class.php
+++ b/libraries/plugins/transformations/Text_Plain_Longtoipv4.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the long to ipv4 transformations interface */
-require_once "abstract/LongToIPv4TransformationsPlugin.class.php";
+require_once 'abstract/LongToIPv4TransformationsPlugin.class.php';
 
 /**
  * Handles the long to ipv4 transformation for text plain
diff --git a/libraries/plugins/transformations/Text_Plain_Sql.class.php b/libraries/plugins/transformations/Text_Plain_Sql.class.php
index 3b892b2827..952d4fe7f6 100644
--- a/libraries/plugins/transformations/Text_Plain_Sql.class.php
+++ b/libraries/plugins/transformations/Text_Plain_Sql.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the sql transformations interface */
-require_once "abstract/SQLTransformationsPlugin.class.php";
+require_once 'abstract/SQLTransformationsPlugin.class.php';
 
 /**
  * Handles the sql transformation for text plain
diff --git a/libraries/plugins/transformations/Text_Plain_Substring.class.php b/libraries/plugins/transformations/Text_Plain_Substring.class.php
index 3f28c987e4..fc0ab02412 100644
--- a/libraries/plugins/transformations/Text_Plain_Substring.class.php
+++ b/libraries/plugins/transformations/Text_Plain_Substring.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the substring transformations interface */
-require_once "abstract/SubstringTransformationsPlugin.class.php";
+require_once 'abstract/SubstringTransformationsPlugin.class.php';
 
 /**
  * Handles the substring transformation for text plain
diff --git a/libraries/plugins/transformations/abstract/AppendTransformationsPlugin.class.php b/libraries/plugins/transformations/abstract/AppendTransformationsPlugin.class.php
index bd0661f805..08582e49c9 100644
--- a/libraries/plugins/transformations/abstract/AppendTransformationsPlugin.class.php
+++ b/libraries/plugins/transformations/abstract/AppendTransformationsPlugin.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the transformations interface */
-require_once "libraries/plugins/TransformationsPlugin.class.php";
+require_once 'libraries/plugins/TransformationsPlugin.class.php';
 
 /**
  * Provides common methods for all of the append transformations plugins.
diff --git a/libraries/plugins/transformations/abstract/DateFormatTransformationsPlugin.class.php b/libraries/plugins/transformations/abstract/DateFormatTransformationsPlugin.class.php
index 64986c5637..530379f10d 100644
--- a/libraries/plugins/transformations/abstract/DateFormatTransformationsPlugin.class.php
+++ b/libraries/plugins/transformations/abstract/DateFormatTransformationsPlugin.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the transformations interface */
-require_once "libraries/plugins/TransformationsPlugin.class.php";
+require_once 'libraries/plugins/TransformationsPlugin.class.php';
 
 /**
  * Provides common methods for all of the date format transformations plugins.
diff --git a/libraries/plugins/transformations/abstract/DownloadTransformationsPlugin.class.php b/libraries/plugins/transformations/abstract/DownloadTransformationsPlugin.class.php
index 3f081c3895..82eda40f72 100644
--- a/libraries/plugins/transformations/abstract/DownloadTransformationsPlugin.class.php
+++ b/libraries/plugins/transformations/abstract/DownloadTransformationsPlugin.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the transformations interface */
-require_once "libraries/plugins/TransformationsPlugin.class.php";
+require_once 'libraries/plugins/TransformationsPlugin.class.php';
 
 /**
  * Provides common methods for all of the download transformations plugins.
diff --git a/libraries/plugins/transformations/abstract/ExternalTransformationsPlugin.class.php b/libraries/plugins/transformations/abstract/ExternalTransformationsPlugin.class.php
index 807ee36a6c..f93f0695a2 100644
--- a/libraries/plugins/transformations/abstract/ExternalTransformationsPlugin.class.php
+++ b/libraries/plugins/transformations/abstract/ExternalTransformationsPlugin.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the transformations interface */
-require_once "libraries/plugins/TransformationsPlugin.class.php";
+require_once 'libraries/plugins/TransformationsPlugin.class.php';
 
 /**
  * Provides common methods for all of the external transformations plugins.
diff --git a/libraries/plugins/transformations/abstract/FormattedTransformationsPlugin.class.php b/libraries/plugins/transformations/abstract/FormattedTransformationsPlugin.class.php
index 0e93835380..e6bb8d9ba9 100644
--- a/libraries/plugins/transformations/abstract/FormattedTransformationsPlugin.class.php
+++ b/libraries/plugins/transformations/abstract/FormattedTransformationsPlugin.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the transformations interface */
-require_once "libraries/plugins/TransformationsPlugin.class.php";
+require_once 'libraries/plugins/TransformationsPlugin.class.php';
 
 /**
  * Provides common methods for all of the formatted transformations plugins.
diff --git a/libraries/plugins/transformations/abstract/HexTransformationsPlugin.class.php b/libraries/plugins/transformations/abstract/HexTransformationsPlugin.class.php
index 9bb14475ad..8022da9e05 100644
--- a/libraries/plugins/transformations/abstract/HexTransformationsPlugin.class.php
+++ b/libraries/plugins/transformations/abstract/HexTransformationsPlugin.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the transformations interface */
-require_once "libraries/plugins/TransformationsPlugin.class.php";
+require_once 'libraries/plugins/TransformationsPlugin.class.php';
 
 /**
  * Provides common methods for all of the hex transformations plugins.
diff --git a/libraries/plugins/transformations/abstract/ImageLinkTransformationsPlugin.class.php b/libraries/plugins/transformations/abstract/ImageLinkTransformationsPlugin.class.php
index b8f9836c5f..456f102bd1 100644
--- a/libraries/plugins/transformations/abstract/ImageLinkTransformationsPlugin.class.php
+++ b/libraries/plugins/transformations/abstract/ImageLinkTransformationsPlugin.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the transformations interface */
-require_once "libraries/plugins/TransformationsPlugin.class.php";
+require_once 'libraries/plugins/TransformationsPlugin.class.php';
 /* For PMA_transformation_global_html_replace */
 require_once 'libraries/transformations.lib.php';
 
diff --git a/libraries/plugins/transformations/abstract/InlineTransformationsPlugin.class.php b/libraries/plugins/transformations/abstract/InlineTransformationsPlugin.class.php
index ccf8c2b749..b1ef0ae457 100644
--- a/libraries/plugins/transformations/abstract/InlineTransformationsPlugin.class.php
+++ b/libraries/plugins/transformations/abstract/InlineTransformationsPlugin.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the transformations interface */
-require_once "libraries/plugins/TransformationsPlugin.class.php";
+require_once 'libraries/plugins/TransformationsPlugin.class.php';
 /* For PMA_transformation_global_html_replace */
 require_once 'libraries/transformations.lib.php';
 
diff --git a/libraries/plugins/transformations/abstract/LongToIPv4TransformationsPlugin.class.php b/libraries/plugins/transformations/abstract/LongToIPv4TransformationsPlugin.class.php
index e7b2ddb33d..58dda957e8 100644
--- a/libraries/plugins/transformations/abstract/LongToIPv4TransformationsPlugin.class.php
+++ b/libraries/plugins/transformations/abstract/LongToIPv4TransformationsPlugin.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the transformations interface */
-require_once "libraries/plugins/TransformationsPlugin.class.php";
+require_once 'libraries/plugins/TransformationsPlugin.class.php';
 
 /**
  * Provides common methods for all of the long to IPv4 transformations plugins.
diff --git a/libraries/plugins/transformations/abstract/SQLTransformationsPlugin.class.php b/libraries/plugins/transformations/abstract/SQLTransformationsPlugin.class.php
index c6d8e6513f..2123cdb3d3 100644
--- a/libraries/plugins/transformations/abstract/SQLTransformationsPlugin.class.php
+++ b/libraries/plugins/transformations/abstract/SQLTransformationsPlugin.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the transformations interface */
-require_once "libraries/plugins/TransformationsPlugin.class.php";
+require_once 'libraries/plugins/TransformationsPlugin.class.php';
 
 /**
  * Provides common methods for all of the SQL transformations plugins.
diff --git a/libraries/plugins/transformations/abstract/SubstringTransformationsPlugin.class.php b/libraries/plugins/transformations/abstract/SubstringTransformationsPlugin.class.php
index 03e7639651..76e0bf1fa3 100644
--- a/libraries/plugins/transformations/abstract/SubstringTransformationsPlugin.class.php
+++ b/libraries/plugins/transformations/abstract/SubstringTransformationsPlugin.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the transformations interface */
-require_once "libraries/plugins/TransformationsPlugin.class.php";
+require_once 'libraries/plugins/TransformationsPlugin.class.php';
 
 /**
  * Provides common methods for all of the substring transformations plugins.
diff --git a/libraries/plugins/transformations/abstract/TextImageLinkTransformationsPlugin.class.php b/libraries/plugins/transformations/abstract/TextImageLinkTransformationsPlugin.class.php
index 3f0d0aa72f..054b2f9b8d 100644
--- a/libraries/plugins/transformations/abstract/TextImageLinkTransformationsPlugin.class.php
+++ b/libraries/plugins/transformations/abstract/TextImageLinkTransformationsPlugin.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the transformations interface */
-require_once "libraries/plugins/TransformationsPlugin.class.php";
+require_once 'libraries/plugins/TransformationsPlugin.class.php';
 /* For PMA_transformation_global_html_replace */
 require_once 'libraries/transformations.lib.php';
 
diff --git a/libraries/plugins/transformations/abstract/TextLinkTransformationsPlugin.class.php b/libraries/plugins/transformations/abstract/TextLinkTransformationsPlugin.class.php
index 385b16c3c7..fdc33b29b6 100644
--- a/libraries/plugins/transformations/abstract/TextLinkTransformationsPlugin.class.php
+++ b/libraries/plugins/transformations/abstract/TextLinkTransformationsPlugin.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* Get the transformations interface */
-require_once "libraries/plugins/TransformationsPlugin.class.php";
+require_once 'libraries/plugins/TransformationsPlugin.class.php';
 /* For PMA_transformation_global_html_replace */
 require_once 'libraries/transformations.lib.php';
 
diff --git a/libraries/properties/options/OptionsPropertyGroup.class.php b/libraries/properties/options/OptionsPropertyGroup.class.php
index 05b96222aa..3a4a0c9f91 100644
--- a/libraries/properties/options/OptionsPropertyGroup.class.php
+++ b/libraries/properties/options/OptionsPropertyGroup.class.php
@@ -10,7 +10,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* This class extends the OptionsPropertyItem class */
-require_once "OptionsPropertyItem.class.php";
+require_once 'OptionsPropertyItem.class.php';
 
 /**
  * Parents group property items and provides methods to manage groups of
diff --git a/libraries/properties/options/OptionsPropertyItem.class.php b/libraries/properties/options/OptionsPropertyItem.class.php
index 4a2418d34b..a1718a2fce 100644
--- a/libraries/properties/options/OptionsPropertyItem.class.php
+++ b/libraries/properties/options/OptionsPropertyItem.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* This class extends the PropertyItem class */
-require_once "libraries/properties/PropertyItem.class.php";
+require_once 'libraries/properties/PropertyItem.class.php';
 
 /**
  * Superclass for
diff --git a/libraries/properties/options/OptionsPropertyOneItem.class.php b/libraries/properties/options/OptionsPropertyOneItem.class.php
index 84b27d37e8..e19c15cd4f 100644
--- a/libraries/properties/options/OptionsPropertyOneItem.class.php
+++ b/libraries/properties/options/OptionsPropertyOneItem.class.php
@@ -10,7 +10,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* This class extends the OptionsPropertyItem class */
-require_once "OptionsPropertyItem.class.php";
+require_once 'OptionsPropertyItem.class.php';
 
 /**
  * Parents only single property items (not groups).
diff --git a/libraries/properties/options/groups/OptionsPropertyMainGroup.class.php b/libraries/properties/options/groups/OptionsPropertyMainGroup.class.php
index 2de7eadf1c..4e69aa7ac8 100644
--- a/libraries/properties/options/groups/OptionsPropertyMainGroup.class.php
+++ b/libraries/properties/options/groups/OptionsPropertyMainGroup.class.php
@@ -10,7 +10,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* This class extends the OptionsPropertyGroup class */
-require_once "libraries/properties/options/OptionsPropertyGroup.class.php";
+require_once 'libraries/properties/options/OptionsPropertyGroup.class.php';
 
 /**
  * Group property item class of type main
diff --git a/libraries/properties/options/groups/OptionsPropertyRootGroup.class.php b/libraries/properties/options/groups/OptionsPropertyRootGroup.class.php
index f1ded7fdb6..a081744fad 100644
--- a/libraries/properties/options/groups/OptionsPropertyRootGroup.class.php
+++ b/libraries/properties/options/groups/OptionsPropertyRootGroup.class.php
@@ -10,7 +10,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* This class extends the OptionsPropertyGroup class */
-require_once "libraries/properties/options/OptionsPropertyGroup.class.php";
+require_once 'libraries/properties/options/OptionsPropertyGroup.class.php';
 
 /**
  * Group property item class of type root
diff --git a/libraries/properties/options/groups/OptionsPropertySubgroup.class.php b/libraries/properties/options/groups/OptionsPropertySubgroup.class.php
index 7a6a5e5a06..0eeb524378 100644
--- a/libraries/properties/options/groups/OptionsPropertySubgroup.class.php
+++ b/libraries/properties/options/groups/OptionsPropertySubgroup.class.php
@@ -10,7 +10,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* This class extends the OptionsPropertyGroup class */
-require_once "libraries/properties/options/OptionsPropertyGroup.class.php";
+require_once 'libraries/properties/options/OptionsPropertyGroup.class.php';
 
 /**
  * Group property item class of type subgroup
diff --git a/libraries/properties/options/items/BoolPropertyItem.class.php b/libraries/properties/options/items/BoolPropertyItem.class.php
index 480921d353..f33067fcd6 100644
--- a/libraries/properties/options/items/BoolPropertyItem.class.php
+++ b/libraries/properties/options/items/BoolPropertyItem.class.php
@@ -10,7 +10,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* This class extends the OptionsPropertyOneItem class */
-require_once "libraries/properties/options/OptionsPropertyOneItem.class.php";
+require_once 'libraries/properties/options/OptionsPropertyOneItem.class.php';
 
 /**
  * Single property item class of type bool
diff --git a/libraries/properties/options/items/DocPropertyItem.class.php b/libraries/properties/options/items/DocPropertyItem.class.php
index bc69e7edbd..55aff6147b 100644
--- a/libraries/properties/options/items/DocPropertyItem.class.php
+++ b/libraries/properties/options/items/DocPropertyItem.class.php
@@ -10,7 +10,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* This class extends the OptionsPropertyOneItem class */
-require_once "libraries/properties/options/OptionsPropertyOneItem.class.php";
+require_once 'libraries/properties/options/OptionsPropertyOneItem.class.php';
 
 /**
  * Single property item class of type doc
diff --git a/libraries/properties/options/items/HiddenPropertyItem.class.php b/libraries/properties/options/items/HiddenPropertyItem.class.php
index f91c5d6e73..53bfe465af 100644
--- a/libraries/properties/options/items/HiddenPropertyItem.class.php
+++ b/libraries/properties/options/items/HiddenPropertyItem.class.php
@@ -10,7 +10,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* This class extends the OptionsPropertyOneItem class */
-require_once "libraries/properties/options/OptionsPropertyOneItem.class.php";
+require_once 'libraries/properties/options/OptionsPropertyOneItem.class.php';
 
 /**
  * Single property item class of type hidden
diff --git a/libraries/properties/options/items/MessageOnlyPropertyItem.class.php b/libraries/properties/options/items/MessageOnlyPropertyItem.class.php
index f80dbc8ad0..98f2e709fc 100644
--- a/libraries/properties/options/items/MessageOnlyPropertyItem.class.php
+++ b/libraries/properties/options/items/MessageOnlyPropertyItem.class.php
@@ -10,7 +10,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* This class extends the OptionsPropertyOneItem class */
-require_once "libraries/properties/options/OptionsPropertyOneItem.class.php";
+require_once 'libraries/properties/options/OptionsPropertyOneItem.class.php';
 
 /**
  * Single property item class of type messageOnly
diff --git a/libraries/properties/options/items/RadioPropertyItem.class.php b/libraries/properties/options/items/RadioPropertyItem.class.php
index 4f7eef3973..4d8ed7a21e 100644
--- a/libraries/properties/options/items/RadioPropertyItem.class.php
+++ b/libraries/properties/options/items/RadioPropertyItem.class.php
@@ -10,7 +10,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* This class extends the OptionsPropertyOneItem class */
-require_once "libraries/properties/options/OptionsPropertyOneItem.class.php";
+require_once 'libraries/properties/options/OptionsPropertyOneItem.class.php';
 
 /**
  * Single property item class of type radio
diff --git a/libraries/properties/options/items/SelectPropertyItem.class.php b/libraries/properties/options/items/SelectPropertyItem.class.php
index 51d294d290..28460c95ab 100644
--- a/libraries/properties/options/items/SelectPropertyItem.class.php
+++ b/libraries/properties/options/items/SelectPropertyItem.class.php
@@ -10,7 +10,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* This class extends the OptionsPropertyOneItem class */
-require_once "libraries/properties/options/OptionsPropertyOneItem.class.php";
+require_once 'libraries/properties/options/OptionsPropertyOneItem.class.php';
 
 /**
  * Single property item class of type select
diff --git a/libraries/properties/options/items/TextPropertyItem.class.php b/libraries/properties/options/items/TextPropertyItem.class.php
index 0e0f0915fd..9339cdf070 100644
--- a/libraries/properties/options/items/TextPropertyItem.class.php
+++ b/libraries/properties/options/items/TextPropertyItem.class.php
@@ -10,7 +10,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* This class extends the OptionsPropertyOneItem class */
-require_once "libraries/properties/options/OptionsPropertyOneItem.class.php";
+require_once 'libraries/properties/options/OptionsPropertyOneItem.class.php';
 
 /**
  * Single property item class of type text
diff --git a/libraries/properties/plugins/ExportPluginProperties.class.php b/libraries/properties/plugins/ExportPluginProperties.class.php
index 51f9d7da79..617089718e 100644
--- a/libraries/properties/plugins/ExportPluginProperties.class.php
+++ b/libraries/properties/plugins/ExportPluginProperties.class.php
@@ -10,7 +10,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* This class extends the PluginPropertyItem class */
-require_once "PluginPropertyItem.class.php";
+require_once 'PluginPropertyItem.class.php';
 
 /**
  * Defines possible options and getters and setters for them.
diff --git a/libraries/properties/plugins/ImportPluginProperties.class.php b/libraries/properties/plugins/ImportPluginProperties.class.php
index 72ee39f9e1..65c3092cff 100644
--- a/libraries/properties/plugins/ImportPluginProperties.class.php
+++ b/libraries/properties/plugins/ImportPluginProperties.class.php
@@ -10,7 +10,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* This class extends the PluginPropertyItem class */
-require_once "PluginPropertyItem.class.php";
+require_once 'PluginPropertyItem.class.php';
 
 /**
  * Defines possible options and getters and setters for them.
diff --git a/libraries/properties/plugins/PluginPropertyItem.class.php b/libraries/properties/plugins/PluginPropertyItem.class.php
index f017e9055d..af46be2251 100644
--- a/libraries/properties/plugins/PluginPropertyItem.class.php
+++ b/libraries/properties/plugins/PluginPropertyItem.class.php
@@ -11,7 +11,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 /* This class extends the PropertyItem class */
-require_once "libraries/properties/PropertyItem.class.php";
+require_once 'libraries/properties/PropertyItem.class.php';
 
 /**
  * Superclass for
diff --git a/libraries/schema/Dia_Relation_Schema.class.php b/libraries/schema/Dia_Relation_Schema.class.php
index b9f4cd5b27..530798db90 100644
--- a/libraries/schema/Dia_Relation_Schema.class.php
+++ b/libraries/schema/Dia_Relation_Schema.class.php
@@ -8,7 +8,7 @@ if (! defined('PHPMYADMIN')) {
     exit;
 }
 
-require_once "Export_Relation_Schema.class.php";
+require_once 'Export_Relation_Schema.class.php';
 
 /**
  * This Class inherits the XMLwriter class and
diff --git a/libraries/schema/Eps_Relation_Schema.class.php b/libraries/schema/Eps_Relation_Schema.class.php
index b3c3f76210..57a91c04e6 100644
--- a/libraries/schema/Eps_Relation_Schema.class.php
+++ b/libraries/schema/Eps_Relation_Schema.class.php
@@ -8,7 +8,7 @@ if (! defined('PHPMYADMIN')) {
     exit;
 }
 
-require_once "Export_Relation_Schema.class.php";
+require_once 'Export_Relation_Schema.class.php';
 
 /**
  * This Class is EPS Library and
diff --git a/schema_export.php b/schema_export.php
index ac399a2131..90f684a2fd 100644
--- a/schema_export.php
+++ b/schema_export.php
@@ -19,7 +19,7 @@ $cfgRelation = PMA_getRelationsParam();
 
 require_once 'libraries/transformations.lib.php';
 require_once 'libraries/Index.class.php';
-require_once "libraries/schema/Export_Relation_Schema.class.php";
+require_once 'libraries/schema/Export_Relation_Schema.class.php';
 
 /**
  * get all the export options and verify
@@ -62,5 +62,5 @@ if (!file_exists('libraries/schema/' . $path . '_Relation_Schema.class.php')) {
         __('File doesn\'t exist')
     );
 }
-require "libraries/schema/".$path."_Relation_Schema.class.php";
+require "libraries/schema/".$path.'_Relation_Schema.class.php';
 $obj_schema = eval("new PMA_".$path."_Relation_Schema();");