- var_dump: documentation ( source)
- mb_detect_encoding: documentation ( source)
<?php
$str = "'muito bom parabéns 😤' AND r0_.avaliacao = 'Parabéns 😤'";
$str_encoding = mb_detect_encoding($str, 'auto');
$str_name = iconv($str_encoding, 'UTF-8', $str);
var_dump($str);