callback function for php preg_replace_callback not getting called on linux CentOS 5.4

I have used the preg_replace_callback as

$string = preg_replace_callback($pattern,'CreateTemplatesContr开发者_高级运维oller::callbackhandler',$string );

I have called the callbackhandler function with the class name as this function is a private static function.

Problem is "callbackhandler" function is not getting called.

Please post if any one know the reason for the same. Thanks in Advance

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According to http://www.php.net/manual/en/language.pseudo-types.php#language.types.callback

It should be array('CreateTemplatesController', 'callbackhandler')