Merge branch '2.8' into 3.4

* 2.8:
  [php_cs] disable fopen_flags
  [CS] Remove unused variables passed to closures
  [CS] Remove empty comment
  [CS] Enforces null type hint on last position in phpDocs
  [CS] Use combined assignment operators when possible
  Fix a typo in error messages
  [Console] Add missing null to input values allowed types
  [PHPUnitBridge] Fix microtime() format
  bumped Symfony version to 2.8.47
  update CONTRIBUTORS for 2.8.46
  updated VERSION for 2.8.46
  updated CHANGELOG for 2.8.46

Intl.php

@@ -187,7 +187,7 @@ public static function getRegionBundle()
     /**
      * Returns the version of the installed ICU library.
      *
-     * @return null|string The ICU version or NULL if it could not be determined
+     * @return string|null The ICU version or NULL if it could not be determined
      */
     public static function getIcuVersion()
     {