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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 |
|---|---|
| 605 | * |
| 606 | * @since 2.8.0 |
| 607 | * @since 4.5.0 `$username` now accepts an email address. |
| 608 | * |
| 609 | * @param null|WP_User|WP_Error $user WP_User if the user is authenticated. |
| 610 | * WP_Error or null otherwise. |
| 611 | * @param string $username Username or email address. |
| 612 | * @param string $password User password. |
| 613 | */ |
| 614 | $user = apply_filters( 'authenticate', null, $username, $password ); |
| 615 | |
| 616 | if ( null == $user ) { |
| 617 | // TODO: What should the error message be? (Or would these even happen?) |
| 618 | // Only needed if all authentication handlers fail to return anything. |
| 619 | $user = new WP_Error( 'authentication_failed', __( '<strong>Error:</strong> Invalid username, email address or incorrect password.' ) ); |
| 620 | } |
| 621 | |
| 622 | $ignore_codes = array( 'empty_username', 'empty_password' ); |
| 623 | |