argon2id-bench.php

<?php
define('BENCH_ROUNDS', 100);
$start = $stop = 0.0;

$short = str_repeat("A", 16);
$long = str_repeat("A", 65535);

$start = microtime(true);
for ($i = 0; $i < BENCH_ROUNDS; ++$i) {
    sodium_crypto_pwhash_str($short, SODIUM_CRYPTO_PWHASH_OPSLIMIT_INTERACTIVE, SODIUM_CRYPTO_PWHASH_MEMLIMIT_INTERACTIVE);
}
$end = microtime(true);

echo "16 char password: ", number_format($end - $start, 3), " seconds.", PHP_EOL;

$start = microtime(true);
for ($i = 0; $i < BENCH_ROUNDS; ++$i) {
    sodium_crypto_pwhash_str($long, SODIUM_CRYPTO_PWHASH_OPSLIMIT_INTERACTIVE, SODIUM_CRYPTO_PWHASH_MEMLIMIT_INTERACTIVE);
}
$end = microtime(true);

echo "65536 char password: ", number_format($end - $start, 3), " seconds.", PHP_EOL;

See https://gist.github.com/paragonie-scott/a2ea385d8d29f0903b6aed4824177464 for an updated version