Check whether your password has been leaked

pwnd.php

<?php
/**
 * Simple method to use the API from https://www.troyhunt.com/ive-just-launched-pwned-passwords-version-2/
 * Released to public domain
 * @return int count
 */
function checkPawnedPasswords(string $password) : int
{
    $sha1 = strtoupper(sha1($password));
    $data = file_get_contents('https://api.pwnedpasswords.com/range/'.substr($sha1, 0, 5));
    if (FALSE !== strpos($data, substr($sha1, 5))) {
        $data = explode(substr($sha1, 5).':', $data);
        $count = (int) $data[1];
    }
    return $count ?? 0;
}