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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 |
|---|---|
| 596 | * Fires after a user login has failed. |
| 597 | * |
| 598 | * @since 2.5.0 |
| 599 | * @since 4.5.0 The value of `$username` can now be an email address. |
| 600 | * @since 5.4.0 The `$error` parameter was added. |
| 601 | * |
| 602 | * @param string $username Username or email address. |
| 603 | * @param WP_Error $error A WP_Error object with the authentication failure details. |
| 604 | */ |
| 605 | do_action( 'wp_login_failed', $username, $error ); |
| 606 | } |
| 607 | |
| 608 | return $user; |
| 609 | } |
| 610 | endif; |
| 611 | |
| 612 | if ( ! function_exists( 'wp_logout' ) ) : |
| 613 | /** |
| 614 | * Log the current user out. |