Merge branch '2.7' into 2.8

* 2.7:
  Using FQ name for PHP_VERSION_ID
  [Form] Fix \IntlDateFormatter timezone parameter usage to bypass PHP bug #66323
  Harden the debugging of Twig filters and functions
  bumped Symfony version to 2.7.29
  updated VERSION for 2.7.28
  update CONTRIBUTORS for 2.7.28
  updated CHANGELOG for 2.7.28

Author: fabpot

Command/ServerCommand.php

@@ -23,7 +23,7 @@ abstract class ServerCommand extends ContainerAwareCommand
      */
     public function isEnabled()
     {
-        if (PHP_VERSION_ID < 50400 || defined('HHVM_VERSION')) {
+        if (\PHP_VERSION_ID < 50400 || defined('HHVM_VERSION')) {
             return false;
         }
 

Templating/Helper/CodeHelper.php

@@ -154,7 +154,7 @@ public function fileExcerpt($file, $line)
      */
     public function formatFile($file, $line, $text = null)
     {
-        if (PHP_VERSION_ID >= 50400) {
+        if (\PHP_VERSION_ID >= 50400) {
             $flags = ENT_QUOTES | ENT_SUBSTITUTE;
         } else {
             $flags = ENT_QUOTES;

Translation/PhpExtractor.php

@@ -85,7 +85,7 @@ public function extract($resource, MessageCatalogue $catalog)
         foreach ($files as $file) {
             $this->parseTokens(token_get_all(file_get_contents($file)), $catalog);
 
-            if (PHP_VERSION_ID >= 70000) {
+            if (\PHP_VERSION_ID >= 70000) {
                 // PHP 7 memory manager will not release after token_get_all(), see https://bugs.php.net/70098
                 gc_mem_caches();
             }