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# XIV. Crack Functions

# 简介

These functions allow you to use the CrackLib library to test the 'strength' of a password. The 'strength' of a password is tested by that checks length, use of upper and lower case and checked against the specified CrackLib dictionary. CrackLib will also give helpful diagnostic messages that will help 'strengthen' the password.

> 注: This extension has been moved to the PECL repository and is no longer bundled with PHP as of PHP 5.0.0.

# 需求

More information regarding CrackLib along with the library can be found at http://www.crypticide.com/users/alecm/.

# 安装

本 PECL 扩展未绑定于 PHP 中。 进一步信息例如新版本，下载，源程序，维护者信息以及更新日志可以在此找到： http://pecl.php.net/package/crack.

在 PHP 4 中本 PECL 扩展的源程序位于 PHP 源程序中的 `ext/` 目录下或者在上面的 PECL 连接中。 In order to use these functions you must compile PHP with Crack support by using the --with-crack[=DIR] configuration option.

Windows users will enable `php_crack.dll` inside of `php.ini` in order to use these functions. 在 PHP 4 中本 DLL 位于 PHP Windows 执行包中的 `extensions/` 目录下。 可以从 PHP 下载页面或者 http://snaps.php.net/ 下载此 PECL 扩展的 DLL 文件。

# 运行时配置

这些函数的行为受 `php.ini` 的影响。

表格 1. Crack configuration options

Name | Default | Changeable | Changelog
--- | --- | --- | ---
crack.default_dictionary | NULL | PHP_INI_SYSTEM | Available since PHP 4.0.5.

有关 PHP_INI_* 常量进一步的细节与定义参见 附录 H。

# 资源类型

本扩展模块未定义任何资源类型。

# 预定义常量

本扩展模块未定义任何常量。

# 例

This example shows how to open a CrackLib dictionary, test a given password, retrieve any diagnostic messages, and close the dictionary.

例子 1. CrackLib example
`<?php // Open CrackLib Dictionary $dictionary = crack_opendict('/usr/local/lib/pw_dict') or die('Unable to open CrackLib dictionary'); // Perform password check $check = crack_check($dictionary, 'gx9A2s0x'); // Retrieve messages $diag = crack_getlastmessage(); echo $diag; // 'strong password' // Close dictionary crack_closedict($dictionary); ?>`

> 注: If crack_check() returns `TRUE`, crack_getlastmessage() will return 'strong password'.

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