create an emoji detecting regex

emojis.php

<?php

$data = explode("\n", file_get_contents('https://unicode.org/Public/emoji/11.0/emoji-data.txt'));
$ranges = [];
$toint = function($str) {
    return intval($str, 16);
};

foreach ($data as $line) {
    $line = trim(preg_replace('/[#;].*/', '', $line));
    if($line) {
        $ranges[] = strpos($line, '..') !== false ? array_map($toint, explode('..', $line)) : $toint($line);
    }
}


$chr = function($i) {
    return iconv('UTF-32', 'UTF-8', pack('V', $i));
};

echo '/[' . implode(array_map(function($range) use ($chr) {
    if(is_array($range)) {
        return $chr($range[0]) . '-' . $chr($range[1]);
    }
    return $chr($range);
}, $ranges)) . ']/u';