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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 |
---|---|
599 | * |
600 | * @since 2.8.0 |
601 | * @since 4.5.0 `$username` now accepts an email address. |
602 | * |
603 | * @param null|WP_User|WP_Error $user WP_User if the user is authenticated. |
604 | * WP_Error or null otherwise. |
605 | * @param string $username Username or email address. |
606 | * @param string $password User password |
607 | */ |
608 | $user = apply_filters( 'authenticate', null, $username, $password ); |
609 |
|
610 | if ( null == $user ) { |
611 | // TODO: What should the error message be? (Or would these even happen?) |
612 | // Only needed if all authentication handlers fail to return anything. |
613 | $user = new WP_Error( 'authentication_failed', __( '<strong>Error</strong>: Invalid username, email address or incorrect password.' ) ); |
614 | } |
615 |
|
616 | $ignore_codes = array( 'empty_username', 'empty_password' ); |
617 |
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