bcrypt_benchmark.php

<?php
  // needs password_hash from php 5.5 OR compat library from
  // https://github.com/ircmaxell/password_compat
  require("./password_compat/lib/password.php");
  $i = 10;
  while($i<20) {
    $time_start = microtime(true);
    $password = "password001234567890";
    $hash = password_hash($password, PASSWORD_BCRYPT, array("cost" => $i));
    $time_end = microtime(true);
    $time = $time_end - $time_start;
    echo "Did password_hash cost $i in $time seconds\n";
    $i++;
  }
  ?>