- mb_convert_encoding: documentation ( source)
- var_dump: documentation ( source)
- ini_set: documentation ( source)
- json_encode: documentation ( source)
<?php
$raw = "\xc3\x28";
ini_set('mbstring.substitute_character', "none");
$fixed = mb_convert_encoding($raw, 'UTF-8', 'UTF-8');
var_dump(json_encode($raw));
var_dump(json_encode($fixed));