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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 |
|---|---|
| 549 | if ( is_wp_error( $user ) && ! in_array( $user->get_error_code(), $ignore_codes ) ) { |
| 550 | /** |
| 551 | * Fires after a user login has failed. |
| 552 | * |
| 553 | * @since 2.5.0 |
| 554 | * @since 4.5.0 The value of `$username` can now be an email address. |
| 555 | * |
| 556 | * @param string $username Username or email address. |
| 557 | */ |
| 558 | do_action( 'wp_login_failed', $username ); |
| 559 | } |
| 560 | |
| 561 | return $user; |
| 562 | } |
| 563 | endif; |
| 564 | |
| 565 | if ( ! function_exists( 'wp_logout' ) ) : |
| 566 | /** |
| 567 | * Log the current user out. |