问以这种方式编写PHP代码有任何性能优势吗？

EN

$string = str_replace('?>', '', str_replace( array('<?php', '<?'), '', preg_replace_callback( "/\?>((.|\n)*?)<\?(php)?/","eval_mixed_helper",$string) ) );

    // first find every chunk of html between a php end tag and the next start tag
    // and wrap it with a statement provided by the callback
$string = preg_replace_callback( "/\?>((.|\n)*?)<\?(php)?/","eval_mixed_helper",$string);  

    // next, remove all php start tags
$string = str_replace(array('<?php', '<?'), '', $string);

    // lastly, remove all php end tags
$string = str_replace('?>', '', $string);