Merge branch '3.4' into 4.0

* 3.4:
  fix merge
  fixed wrong description in a phpdoc
  19 digits VISA card numbers are valid
  Add missing @ in phpdoc return statement
  Don't right trim the deprecation message
  [HttpKernel] Fixed test name
  [Debug] prevent infinite loop with faulty exception handlers
  [FrameworkBundle] fix tests
  Prefer composer install instead for using Symfony Installer
  Add the missing `enabled` session attribute
  [HttpKernel] Turn bad hosts into 400 instead of 500

Author: nicolas-grekas

Constraints/CardSchemeValidator.php

@@ -78,9 +78,9 @@ class CardSchemeValidator extends ConstraintValidator
             '/^5[1-5][0-9]{14}$/',
             '/^2(22[1-9][0-9]{12}|2[3-9][0-9]{13}|[3-6][0-9]{14}|7[0-1][0-9]{13}|720[0-9]{12})$/',
         ),
-        // All Visa card numbers start with a 4. New cards have 16 digits. Old cards have 13.
+        // All Visa card numbers start with a 4 and have a length of 13, 16, or 19 digits.
         'VISA' => array(
-            '/^4([0-9]{12}|[0-9]{15})$/',
+            '/^4([0-9]{12}|[0-9]{15}|[0-9]{18})$/',
         ),
     );
 

Tests/Constraints/CardSchemeValidatorTest.php

@@ -106,6 +106,7 @@ public function getValidNumbers()
             array('VISA', '4111111111111111'),
             array('VISA', '4012888888881881'),
             array('VISA', '4222222222222'),
+            array('VISA', '4917610000000000003'),
             array(array('AMEX', 'VISA'), '4111111111111111'),
             array(array('AMEX', 'VISA'), '378282246310005'),
             array(array('JCB', 'MASTERCARD'), '5105105105105100'),