vendor/ircmaxell/password-compat/lib/password.php

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<?php
/**
 * A Compatibility library with PHP 5.5's simplified password hashing API.
 *
 * @author Anthony Ferrara <ircmaxell@php.net>
 * @license http://www.opensource.org/licenses/mit-license.html MIT License
 * @copyright 2012 The Authors
 */

namespace {

    if (!defined('PASSWORD_BCRYPT')) {
        /**
         * PHPUnit Process isolation caches constants, but not function declarations.
         * So we need to check if the constants are defined separately from 
         * the functions to enable supporting process isolation in userland
         * code.
         */
        define('PASSWORD_BCRYPT', 1);
        define('PASSWORD_DEFAULT', PASSWORD_BCRYPT);
        define('PASSWORD_BCRYPT_DEFAULT_COST', 10);
    }

    if (!function_exists('password_hash')) {

        /**
         * Hash the password using the specified algorithm
         *
         * @param string $password The password to hash
         * @param int    $algo     The algorithm to use (Defined by PASSWORD_* constants)
         * @param array  $options  The options for the algorithm to use
         *
         * @return string|false The hashed password, or false on error.
         */
        function password_hash($password, $algo, array $options = array()) {
            if (!function_exists('crypt')) {
                trigger_error("Crypt must be loaded for password_hash to function", E_USER_WARNING);
                return null;
            }
            if (is_null($password) || is_int($password)) {
                $password = (string) $password;
            }
            if (!is_string($password)) {
                trigger_error("password_hash(): Password must be a string", E_USER_WARNING);
                return null;
            }
            if (!is_int($algo)) {
                trigger_error("password_hash() expects parameter 2 to be long, " . gettype($algo) . " given", E_USER_WARNING);
                return null;
            }
            $resultLength = 0;
            switch ($algo) {
                case PASSWORD_BCRYPT:
                    $cost = PASSWORD_BCRYPT_DEFAULT_COST;
                    if (isset($options['cost'])) {
                        $cost = $options['cost'];
                        if ($cost < 4 || $cost > 31) {
                            trigger_error(sprintf("password_hash(): Invalid bcrypt cost parameter specified: %d", $cost), E_USER_WARNING);
                            return null;
                        }