symfony
diff --git a/‎src/Symfony/Bridge/PhpUnit/DeprecationErrorHandler.php
Lines changed: 17 additions & 6 deletions b/‎src/Symfony/Bridge/PhpUnit/DeprecationErrorHandler.php
Lines changed: 17 additions & 6 deletions
@@ -36,6 +36,7 @@ class DeprecationErrorHandler
         'other' => array(),
         'remaining vendor' => array(),
     );
+    private static $utilPrefix = '';
 
     /**
      * Registers and configures the deprecation handler.
@@ -56,12 +57,10 @@ public static function register($mode = 0)
             return;
         }
 
-        $UtilPrefix = class_exists('PHPUnit_Util_ErrorHandler') ? 'PHPUnit_Util_' : 'PHPUnit\Util\\';
-
-        $deprecationHandler = function ($type, $msg, $file, $line, $context = array()) use ($mode, $UtilPrefix) {
+        $deprecationHandler = function ($type, $msg, $file, $line, $context = array()) use ($mode) {
             $mode = self::getMode($mode);
             if ((E_USER_DEPRECATED !== $type && E_DEPRECATED !== $type) || self::MODE_DISABLED === $mode) {
-                $ErrorHandler = $UtilPrefix.'ErrorHandler';
+                $ErrorHandler = self::utilPrefix().'ErrorHandler';
 
                 return $ErrorHandler::handleError($type, $msg, $file, $line, $context);
             }
@@ -91,7 +90,7 @@ public static function register($mode = 0)
                     $method = $trace[$i]['function'];
                 }
 
-                $Test = $UtilPrefix.'Test';
+                $Test = self::utilPrefix().'Test';
 
                 if (0 !== error_reporting()) {
                     $group = 'unsilenced';
@@ -138,7 +137,7 @@ public static function register($mode = 0)
 
         if (null !== $oldErrorHandler) {
             restore_error_handler();
-            if (array($UtilPrefix.'ErrorHandler', 'handleError') === $oldErrorHandler) {
+            if (array(self::utilPrefix().'ErrorHandler', 'handleError') === $oldErrorHandler) {
                 restore_error_handler();
                 self::register($mode);
             }
@@ -371,4 +370,16 @@ private static function displayDeprecations($groups, $mode)
             echo "\n";
         }
     }
+
+    /**
+     * @return string
+     */
+    private static function utilPrefix()
+    {
+        if ('' !== self::$utilPrefix) {
+            return self::$utilPrefix;
+        }
+
+        return self::$utilPrefix = (class_exists('PHPUnit_Util_ErrorHandler') ? 'PHPUnit_Util_' : 'PHPUnit\Util\\');
+    }
 }