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chie/include/_utils.php

18 lines
433 B
PHP

<?php
function unique_chars(string $input, bool $multibyte = true): int {
$chars = [];
$strlen = $multibyte ? 'mb_strlen' : 'strlen';
$substr = $multibyte ? 'mb_substr' : 'substr';
$length = $strlen($input);
for($i = 0; $i < $length; $i++) {
$current = $substr($input, $i, 1);
if(!in_array($current, $chars, true)) {
$chars[] = $current;
}
}
return count($chars);
}