Add zpp check to spl_classes()

Author: nikic

ext/spl/php_spl.c

@@ -237,6 +237,10 @@ PHP_FUNCTION(class_uses)
  Return an array containing the names of all clsses and interfaces defined in SPL */
 PHP_FUNCTION(spl_classes)
 {
+	if (zend_parse_parameters_none() == FAILURE) {
+		return;
+	}
+
 	array_init(return_value);
 
 	SPL_LIST_CLASSES(return_value, 0, 0, 0)