dedecms织梦正则图片alt递增数字

{dede:field.body runphp=yes}
$string = @me;
$myi = 1;
@me = preg_replace_callback(‘/(<img.*?alt=[\”|\’])(.*?)([\”|\’].*?>)/’, function($match) use (&$myi){return $match[1].$match[2].($myi++).$match[3];},$string);
{/dede:field.body}