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# XIV. Crack Functions

# 介紹

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.org/users/alecm/.

# 安裝

This PECL extension is not bundled with PHP. Additional information such as new releases, downloads, source files, maintainer information, and a CHANGELOG, can be located here: http://pecl.php.net/package/crack.

In PHP 4 this PECL extensions source can be found in the `ext/` directory within the PHP source or at the PECL link above. 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. In PHP 4 this DLL resides in the `extensions/` directory within the PHP Windows binaries download. You may download this PECL extension DLL from the PHP Downloads page or at http://snaps.php.net/.

# 執行時期組態

`php.ini`中的設定會影響這些函數的行為。

表格 1. Crack configuration options

Name | Default | Changeable
--- | --- | ---
crack.default_dictionary | NULL | PHP_INI_SYSTEM

For further details and definitions of the PHP_INI_* constants, see the 附錄 H.

# 資源類型

這個延伸沒有定義任何資源。

# 預先定義常數

這個延伸沒有定義任何常數。

# 範例

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

範例 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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