- strcasecmp: documentation ( source)
- print_r: documentation ( source)
- strtoupper: documentation ( source)
- setlocale: documentation ( source)
<?php
$chars = "\xE4";
setlocale(LC_CTYPE, "de_DE", "de", "german", "ge", "de_DE.ISO8859-1", "ISO8859-1");
print_r($chars);
print_r(strtoupper($chars));
echo strcasecmp($chars, strtoupper($chars))."\n";