Merge branch '3.3' into 3.4

* 3.3:
  [CS][2.7] yoda_style, no_unneeded_curly_braces, no_unneeded_final_method, semicolon_after_instruction
  [Filesystem] mirror - fix copying content with same name as source/target.
  Removed unnecessary getDefinition() call.
  .php_cs.dist - simplify config
  [WebProfilerBundle] fixed TemplateManager when using Twig 2 without compat interfaces

Author: nicolas-grekas

Adapter/ExtLdap/Adapter.php

@@ -73,10 +73,10 @@ public function escape($subject, $ignore = '', $flags = 0)
 
         // Per RFC 4514, leading/trailing spaces should be encoded in DNs, as well as carriage returns.
         if ((int) $flags & LDAP_ESCAPE_DN) {
-            if (!empty($value) && $value[0] === ' ') {
+            if (!empty($value) && ' ' === $value[0]) {
                 $value = '\\20'.substr($value, 1);
             }
-            if (!empty($value) && $value[strlen($value) - 1] === ' ') {
+            if (!empty($value) && ' ' === $value[strlen($value) - 1]) {
                 $value = substr($value, 0, -1).'\\20';
             }
             $value = str_replace("\r", '\0d', $value);