minor symfony#10380 fixed some HHVM bugs (fabpot)

This PR was merged into the 2.3 branch.

Discussion
----------

fixed some HHVM bugs

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

This is a workaround for facebook/hhvm#1161. I made the change as the workaround does the same thing and the eval is part of unit tests.

Commits
-------

d014dac made Cookie stringification more robust
fa24749 [Yaml] fix for a HHVM bug

Author: fabpot

src/Symfony/Component/BrowserKit/Cookie.php

@@ -96,7 +96,7 @@ public function __toString()
                 throw new \UnexpectedValueException(sprintf('The cookie expiration time "%s" is not valid.'), $this->expires);
             }
 
-            $cookie .= '; expires='.substr($dateTime->format(self::$dateFormats[0]), 0, -5);
+            $cookie .= '; expires='.str_replace('+0000', '', $dateTime->format(self::$dateFormats[0]));
         }
 
         if ('' !== $this->domain) {

src/Symfony/Component/HttpKernel/DataCollector/RequestDataCollector.php

@@ -304,7 +304,7 @@ private function getCookieHeader($name, $value, $expires, $path, $domain, $secur
                 }
             }
 
-            $cookie .= '; expires='.substr(\DateTime::createFromFormat('U', $expires, new \DateTimeZone('UTC'))->format('D, d-M-Y H:i:s T'), 0, -5);
+            $cookie .= '; expires='.str_replace('+0000', '', \DateTime::createFromFormat('U', $expires, new \DateTimeZone('GMT'))->format('D, d-M-Y H:i:s T'));
         }
 
         if ($domain) {

src/Symfony/Component/Yaml/Tests/DumperTest.php

@@ -95,7 +95,7 @@ public function testSpecifications()
                 } elseif (isset($test['todo']) && $test['todo']) {
                     // TODO
                 } else {
-                    $expected = eval('return '.trim($test['php']).';');
+                    eval('$expected = '.trim($test['php']).';');
 
                     $this->assertEquals($expected, $this->parser->parse($this->dumper->dump($expected, 10)), $test['test']);
                 }

src/Symfony/Component/Yaml/Tests/ParserTest.php

@@ -62,9 +62,9 @@ public function getDataFormSpecifications()
                 if (isset($test['todo']) && $test['todo']) {
                     // TODO
                 } else {
-                    $expected = var_export(eval('return '.trim($test['php']).';'), true);
+                    eval('$expected = '.trim($test['php']).';');
 
-                    $tests[] = array($file, $expected, $test['yaml'], $test['test']);
+                    $tests[] = array($file, var_export($expected, true), $test['yaml'], $test['test']);
                 }
             }
         }