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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 |
|---|---|
| 531 | if (is_wp_error($user) && !in_array($user->get_error_code(), $ignore_codes) ) { |
| 532 | /** |
| 533 | * Fires after a user login has failed. |
| 534 | * |
| 535 | * @since 2.5.0 |
| 536 | * @since 4.5.0 The value of `$username` can now be an email address. |
| 537 | * |
| 538 | * @param string $username Username or email address. |
| 539 | */ |
| 540 | do_action( 'wp_login_failed', $username ); |
| 541 | } |
| 542 | |
| 543 | return $user; |
| 544 | } |
| 545 | endif; |
| 546 | |
| 547 | if ( !function_exists('wp_logout') ) : |
| 548 | /** |
| 549 | * Log the current user out. |