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.
More information regarding CrackLib along with the library can be found at » http://www.crypticide.org/users/alecm/.
In order to use these functions, you must compile PHP with Crack support by using the --with-crack[=DIR] option.
The behaviour of these functions is affected by settings in php.ini.
| Name | Default | Changeable |
|---|---|---|
| crack.default_dictionary | NULL | PHP_INI_SYSTEM |
For further details and definition of the PHP_INI_* constants see ini_set().
This example shows how to open a CrackLib dictionary, test a given password, retrieve any diagnostic messages, and close the dictionary.
<?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);
?>If crack_check() returns TRUE, crack_getlastmessage() will return 'strong password'.
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