将preg_replace（）替换为preg_replace_callback（）

Question

$source = preg_replace('/&#(\d+);/me', "utf8_encode(chr(\\1))", $source);

上面的代码给出了不推荐的警告。

Deprecated: preg_replace(): The /e modifier is deprecated, use preg_replace_callback instead in 

如何将preg_replace（）替换为preg_replace_callback（）？

Answer 1

请阅读此处的文档http://www.php.net/manual/en/function.preg-replace-callback.php

以下是preg_replace_callback

的示例

$source = preg_replace_callback('/&#(\d+);/m', function($matches){
   return utf8_encode(chr($matches[1]));
}, $source);

Answer 2

$source = preg_replace_callback
(
    '/\&\#(\d+)\;/m',
    function($match){
        return utf8_encode(chr($match[1]));
    },
    $source
);