Test Unicode normalization of given file name

test-norm.php

<?php
// ref: https://www.win.tue.nl/~aeb/linux/uc/nfc_vs_nfd.html
$s = $argv[1];

if (\Normalizer::isNormalized($s, \Normalizer::FORM_D)) {
    print("Original string is using NFD normalization\n");
    $nfc = \Normalizer::normalize($s, \Normalizer::FORM_C);
    print("NFC: $nfc\n");
    print("NFD: $s\n");
} elseif (\Normalizer::isNormalized($s, \Normalizer::FORM_C)) {
    print("Original string is using NFC normalization\n");
    $nfd = \Normalizer::normalize($s, \Normalizer::FORM_D);
    print("NFC: $s\n");
    print("NFD: $nfd\n");
} else {
    print("Unknown normalization\n");
}