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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )
apply_filters( "hook_name", "what_to_filter" )
.Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
Line | Code |
---|---|
522 | * |
523 | * @param string $username User's username |
524 | * @param string $password User's password |
525 | * @return WP_Error|WP_User WP_User object if login successful, otherwise WP_Error object. |
526 | */ |
527 | function wp_authenticate($username, $password) { |
528 | $username = sanitize_user($username); |
529 | $password = trim($password); |
530 |
|
531 | $user = apply_filters('authenticate', null, $username, $password); |
532 |
|
533 | if ( $user == null ) { |
534 | // TODO what should the error message be? (Or would these even happen?) |
535 | // Only needed if all authentication handlers fail to return anything. |
536 | $user = new WP_Error('authentication_failed', __('<strong>ERROR</strong>: Invalid username or incorrect password.')); |
537 | } |
538 |
|
539 | $ignore_codes = array('empty_username', 'empty_password'); |
540 |
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