Simple method to check the Pwned Passwords API using PHP

checkPawnedPasswords.php

<?php
/**
 * Simple method to use the API from https://www.troyhunt.com/ive-just-launched-pwned-passwords-version-2/
 * Written by Jim Westergren and 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;
}

What if the given password's hash matches the first returned from the api? Wouldn't strpos() would return 0 ?

I'd change line 11 to
if (FALSE !== strpos($data, substr($sha1, 5))) {

@hazzlewis Good catch. I have updated the code.

Does it need the whole installation of the library first or this code alone will do the trick?

Does it need the whole installation of the library first or this code alone will do the trick?
@MedeirosGuilherme Those lines is all that is needed.