- var_dump: documentation ( source)
- bin2hex: documentation ( source)
- preg_match_all: documentation ( source)
<?php
$x = '/[^A-Za-z0-9 \r\n@£$¥èéùìòÇØøÅå\x\{0394\}\x\{03A6\}\x\{0393\}\x\{039B\}\x\{03A9\}\x\{03A0\}\x\{03A8\}\x\{03A3\}\x\{0398\}\x\{039E\}ÆæßÉ!"#$%&\'()*+,\-.\/:;<><=>?¡ÄÖÑܧ¿äöñüà^{}\\\[~\]|\x\{20AC\}]+/';
$data = 'asdf‘‼';
$tmp = [];
$result = preg_match_all($x,$data,$tmp);
var_dump($tmp);
$z = $tmp[0][0];
#$z = utf8_encode($z);
#$z = iconv(mb_detect_encoding($z, mb_detect_order(), true), "UTF-8", $z);
#var_dump(mb_detect_encoding($z));
var_dump(bin2hex($z));