Fix Long2IP issue with PHP7.1

Since PHP7.1, as long2ip expects an int, due to the strict_mode, PHP throws an error.

Signed-off-by: Hugues Peccatte <hugues.peccatte@gmail.com>

libraries/classes/Plugins/Transformations/Abs/LongToIPv4TransformationsPlugin.php

@@ -9,6 +9,7 @@
 namespace PhpMyAdmin\Plugins\Transformations\Abs;
 
 use PhpMyAdmin\Plugins\TransformationsPlugin;
+use PhpMyAdmin\Util;
 
 /**
  * Provides common methods for all of the long to IPv4 transformations plugins.
@@ -41,14 +42,13 @@ abstract class LongToIPv4TransformationsPlugin extends TransformationsPlugin
      */
     public function applyTransformation($buffer, array $options = array(), $meta = '')
     {
-        if ($buffer < 0 || $buffer > 4294967295) {
+        if (! Util::isInteger($buffer) || $buffer < 0 || $buffer > 4294967295) {
             return htmlspecialchars($buffer);
         }
 
-        return long2ip($buffer);
+        return long2ip((int) $buffer);
     }
 
-
     /* ~~~~~~~~~~~~~~~~~~~~ Getters and Setters ~~~~~~~~~~~~~~~~~~~~ */
 
     /**

libraries/classes/Util.php

@@ -4741,4 +4741,16 @@ class Util
 
         return self::linkOrButton($url, $title . $orderImg, $orderLinkParams);
     }
+
+    /**
+     * Check that input is an int or an int in a string
+     *
+     * @param mixed $input
+     *
+     * @return bool
+     */
+    public static function isInteger($input)
+    {
+        return (ctype_digit((string) $input));
+    }
 }