- array_map: documentation ( source)
- var_dump: documentation ( source)
- implode: documentation ( source)
- str_split: documentation ( source)
<?php
$text = 'Hello world';
$result = str_split($text);
$result = array_map('ord', $result);
$result = array_map('dechex', $result);
var_dump("0x" . implode('', $result));