PHP - Remove HTML entities

unhtmlentities.php

<?php

function unhtmlentities($string) {
    $string = preg_replace_callback('~&#x([0-9a-f]+);~i', function ($matches) { return chr(hexdec($matches[0])); }, $string);
    $string = preg_replace_callback('~&#([0-9]+);~', function ($matches) { return chr((int) $matches[0]); }, $string);

    $trans_tbl = get_html_translation_table(HTML_ENTITIES);
    $trans_tbl = array_flip($trans_tbl);

    return strtr($string, $trans_tbl);
}

updated to work with PHP 8.0.0