minor symfony#25619 Error handlers' $context should be optional as it's deprecated (nicolas-grekas)

This PR was merged into the 3.3 branch.

Discussion
----------

Error handlers' $context should be optional as it's deprecated

| Q             | A
| ------------- | ---
| Branch?       | 3.3
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Commits
-------

f4fcbcd Error handlers' $context should be optional as it's deprecated

Author: nicolas-grekas

src/Symfony/Component/Config/ResourceCheckerConfigCache.php

@@ -82,7 +82,7 @@ public function isFresh()
         $time = filemtime($this->file);
         $signalingException = new \UnexpectedValueException();
         $prevUnserializeHandler = ini_set('unserialize_callback_func', '');
-        $prevErrorHandler = set_error_handler(function ($type, $msg, $file, $line, $context) use (&$prevErrorHandler, $signalingException) {
+        $prevErrorHandler = set_error_handler(function ($type, $msg, $file, $line, $context = array()) use (&$prevErrorHandler, $signalingException) {
             if (E_WARNING === $type && 'Class __PHP_Incomplete_Class has no unserializer' === $msg) {
                 throw $signalingException;
             }

src/Symfony/Component/HttpFoundation/Session/Storage/NativeSessionStorage.php

@@ -221,7 +221,7 @@ public function regenerate($destroy = false, $lifetime = null)
     public function save()
     {
         // Register custom error handler to catch a possible failure warning during session write
-        set_error_handler(function ($errno, $errstr, $errfile, $errline, $errcontext) {
+        set_error_handler(function ($errno, $errstr, $errfile, $errline, $errcontext = array()) {
             throw new ContextErrorException($errstr, $errno, E_WARNING, $errfile, $errline, $errcontext);
         }, E_WARNING);
 

src/Symfony/Component/PropertyAccess/PropertyAccessor.php

@@ -245,7 +245,7 @@ public function setValue(&$objectOrArray, $propertyPath, $value)
     /**
      * @internal
      */
-    public static function handleError($type, $message, $file, $line, $context)
+    public static function handleError($type, $message, $file, $line, $context = array())
     {
         if (E_RECOVERABLE_ERROR === $type) {
             self::throwInvalidArgumentException($message, debug_backtrace(false), 1);

src/Symfony/Component/VarDumper/Cloner/AbstractCloner.php

@@ -195,7 +195,7 @@ public function setMaxString($maxString)
      */
     public function cloneVar($var, $filter = 0)
     {
-        $this->prevErrorHandler = set_error_handler(function ($type, $msg, $file, $line, $context) {
+        $this->prevErrorHandler = set_error_handler(function ($type, $msg, $file, $line, $context = array()) {
             if (E_RECOVERABLE_ERROR === $type || E_USER_ERROR === $type) {
                 // Cloner never dies
                 throw new \ErrorException($msg, 0, $type, $file, $line);