- array_map: documentation ( source)
- mb_convert_encoding: documentation ( source)
- var_dump: documentation ( source)
- array_filter: documentation ( source)
- range: documentation ( source)
<?php
$chars = array_map('chr', range(32, 126));
$diff = array_filter(
$chars,
function ($c) { return $c !== mb_convert_encoding($c, 'UTF-8', 'SJIS'); }
);
var_dump($diff);