Replace preg_replace() to preg_replace_callback() [duplicate]

Answer 1

Read the documentation here, http://www.php.net/manual/en/function.preg-replace-callback.php

Here is an example of preg_replace_callback

$source = preg_replace_callback('/&#(\d+);/m', function($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
);