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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 |
|---|---|
| 553 | * Fires after a user login has failed. |
| 554 | * |
| 555 | * @since 2.5.0 |
| 556 | * @since 4.5.0 The value of `$username` can now be an email address. |
| 557 | * @since 5.4.0 The `$error` parameter was added. |
| 558 | * |
| 559 | * @param string $username Username or email address. |
| 560 | * @param WP_Error $error A WP_Error object with the authentication failure details. |
| 561 | */ |
| 562 | do_action( 'wp_login_failed', $username, $error ); |
| 563 | } |
| 564 | |
| 565 | return $user; |
| 566 | } |
| 567 | endif; |
| 568 | |
| 569 | if ( ! function_exists( 'wp_logout' ) ) : |
| 570 | /** |
| 571 | * Log the current user out. |