Function validatePassword

Checks whether a password meets the current forum rules - called when registering/choosing a password. - checks the password obeys the current forum settings for password strength. - if password checking is enabled, will check that none of the words in restrict_in appear in the password. - returns an error identifier if the password is invalid, or null.

Package: SMF
Copyright: 2020 Simple Machines and individual contributors
License: BSD
Author: Simple Machines https://www.simplemachines.org
Located at Sources/Subs-Auth.php

Parameters summary
`string`	`$password`	The desired password
`string`	`$username`	The username
`array`	`$restrict_in = array()`	An array of restricted strings that cannot be part of the password (email address, username, etc.)

Return value summary
`null\|string`	Null if valid or a string indicating what the problem was

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Function validatePassword