php5.5 preg_replace 使用e问题，改写成preg_replace_callback

Question

publicfunctionentity_decode($str,$charset='UTF-8'){if(stristr($str,'&')===FALSE){return$str;}$str=html_entity_decode($str,ENT_COMPAT,$charset);$str=preg_replace('~&#x(0*[0-9a-f]{2,5})~ei','chr(hexdec("\\1"))',$str);returnpreg_replace('~&#([0-9]{2,4})~e','chr(\\1)',$str);}麻烦使用preg_replace_callback改写下该方法，谢谢。

Answer 1

phppublicfunctionentity_decode($str,$charset='UTF-8'){
if(stristr($str,'&')===false){
return$str;
}
$str=html_entity_decode($str,ENT_COMPAT,$charset);
$str=preg_replace_callback(
'/&#x(0*[0-9a-f]{2,5})/i',
function($matches){
returnchr(hexdec($matches[1]));
},
$str
);
returnpreg_replace_callback('/&#([0-9]{2,4})/',function($matches){
returnchr($matches[1]);
},$str);
}