title: What is the default algorithm in password_hash
body: <p>Reading the documentation about a new <a href="http://www.php.net/manual/en/function.password-hash.php" rel="noreferrer">password_hash</a> function for PHP 5.5, I am wondering, what is the default algorithm:</p>
  
  <pre><code>password_hash("rasmuslerdorf", PASSWORD_DEFAULT);
  </code></pre>
  
  <p>Documentation about it does not clarify this: <a href="http://www.php.net/manual/en/password.constants.php" rel="noreferrer">http://www.php.net/manual/en/password.constants.php</a></p>