Use strings to represent wildcard characters

A string is made of characters, an array might contain anything.

Author: greg0ire

lib/Doctrine/DBAL/Platforms/AbstractPlatform.php

@@ -43,7 +43,6 @@
 use Doctrine\DBAL\Types;
 use Doctrine\DBAL\Types\Type;
 use function addcslashes;
-use function implode;
 use function preg_quote;
 use function preg_replace;
 use function sprintf;
@@ -3596,7 +3595,7 @@ public function getStringLiteralQuoteCharacter()
     final public function escapeStringForLike(string $inputString, string $escapeChar) : string
     {
         return preg_replace(
-            '~([' . preg_quote(implode('', $this->getLikeWildcardCharacters()) . $escapeChar, '~') . '])~u',
+            '~([' . preg_quote($this->getLikeWildcardCharacters() . $escapeChar, '~') . '])~u',
             addcslashes($escapeChar, '\\') . '$1',
             $inputString
         );
@@ -3607,6 +3606,6 @@ final public function escapeStringForLike(string $inputString, string $escapeCha
      */
     protected function getLikeWildcardCharacters() : array
     {
-        return ['%', '_'];
+        return '%_';
     }
 }

lib/Doctrine/DBAL/Platforms/SQLServer2008Platform.php

@@ -122,6 +122,6 @@ protected function getReservedKeywordsClass()
      */
     protected function getLikeWildcardCharacters() : array
     {
-        return array_merge(parent::getLikeWildcardCharacters(), ['[', ']', '^']);
+        return parent::getLikeWildcardCharacters() . '[]^';
     }
 }