Use hexadecimal numerals instead of hexadecimals in strings to represent error codes.

Author: a-zb

Adapter/ExtLdap/Connection.php

@@ -25,9 +25,9 @@
  */
 class Connection extends AbstractConnection
 {
-    private const LDAP_INVALID_CREDENTIALS = '0x31';
-    private const LDAP_TIMEOUT = '0x55';
-    private const LDAP_ALREADY_EXISTS = '0x44';
+    private const LDAP_INVALID_CREDENTIALS = 0x31;
+    private const LDAP_TIMEOUT = 0x55;
+    private const LDAP_ALREADY_EXISTS = 0x44;
 
     /** @var bool */
     private $bound = false;