- mb_convert_encoding: documentation ( source)
- utf8_encode: documentation ( source)
- json_encode: documentation ( source)
- header: documentation ( source)
<?php
header("Content-Type: application/json; charset=utf-8");
echo json_encode(array("äöü"."-".utf8_encode("äöü")."-".utf8_encode(utf8_encode("äöü"))."-".mb_convert_encoding("äöü", 'UTF-8')."-".mb_convert_encoding(utf8_encode("äöü"), 'UTF-8')));