如何更改重写此代码以使用preg_replace_callback

Question

返回preg_replace（＆＃39; / [\ xC0- \ xF7] [\ x80- \ xBF] / e＆＃39;，＆＃39; mb2entity（＆＃34; \ 0＆＃34;）＆＃39 ;，$ str）;

Answer 1

return preg_replace_callback('/[\xC0-\xF7][\x80-\xBF]/', function($n1) { return mb2entity($n1); }, $str);