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.
Note:
This extension has been moved to the PECL repository and is no longer bundled with
PHP as of PHP 5.0.0.
This PECL extension
is not bundled with PHP.
Information for installing this PECL extension may be
found in the manual chapter titled Installation
of PECL extensions. 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/.
The behaviour of these functions is affected by settings in php.ini.
Table 1. Crack configuration options
| Name | Default | Changeable | Changelog |
|---|
| crack.default_dictionary | NULL | PHP_INI_PERDIR | Available since PHP 4.0.5. |
For further details and definitions of the
PHP_INI_* constants, see the
Appendix G.
The CrackLib extension defines a dictionary resource identifier returned
by crack_opendict().
This extension has no constants defined.
This example shows how to open a CrackLib dictionary, test a given
password, retrieve any diagnostic messages, and close the dictionary.
Example 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);
?>
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