Update PHP dependencies

.travis.yml

@@ -71,7 +71,7 @@ script:
     elif [ ${TESTSUITE} == "lint" ]; then
       php bin/console lint:twig app
       php bin/console lint:yaml app
-      php bin/console security:check --end-point=http://security.sensiolabs.org/check_lock
+      php bin/console security:check --end-point=http://security.symfony.com/check_lock
     else
       $PHPUNIT --testsuite $TESTSUITE --coverage-clover=coverage.xml
       bash <(curl -s https://codecov.io/bash) -X gcov -X coveragepy

var/SymfonyRequirements.php

@@ -389,7 +389,7 @@ public function __construct()
     {
         /* mandatory requirements follow */
 
-        $installedPhpVersion = phpversion();
+        $installedPhpVersion = PHP_VERSION;
         $requiredPhpVersion = $this->getPhpRequiredVersion();
 
         $this->addRecommendation(
@@ -448,15 +448,8 @@ public function __construct()
         }
 
         if (false !== $requiredPhpVersion && version_compare($installedPhpVersion, $requiredPhpVersion, '>=')) {
-            $timezones = array();
-            foreach (DateTimeZone::listAbbreviations() as $abbreviations) {
-                foreach ($abbreviations as $abbreviation) {
-                    $timezones[$abbreviation['timezone_id']] = true;
-                }
-            }
-
             $this->addRequirement(
-                isset($timezones[@date_default_timezone_get()]),
+                in_array(@date_default_timezone_get(), DateTimeZone::listIdentifiers(), true),
                 sprintf('Configured default timezone "%s" must be supported by your installation of PHP', @date_default_timezone_get()),
                 'Your default timezone is not supported by PHP. Check for typos in your <strong>php.ini</strong> file and have a look at the list of deprecated timezones at <a href="http://php.net/manual/en/timezones.others.php">http://php.net/manual/en/timezones.others.php</a>.'
             );
@@ -731,7 +724,7 @@ function_exists('posix_isatty'),
             'Install and/or enable a <strong>PHP accelerator</strong> (highly recommended).'
         );
 
-        if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {
+        if ('WIN' === strtoupper(substr(PHP_OS, 0, 3))) {
             $this->addRecommendation(
                 $this->getRealpathCacheSize() >= 5 * 1024 * 1024,
                 'realpath_cache_size should be at least 5M in php.ini',