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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 |
|---|---|
| 476 | |
| 477 | /** |
| 478 | * Fires after a phpmailerException is caught. |
| 479 | * |
| 480 | * @since 4.4.0 |
| 481 | * |
| 482 | * @param WP_Error $error A WP_Error object with the phpmailerException message, and an array |
| 483 | * containing the mail recipient, subject, message, headers, and attachments. |
| 484 | */ |
| 485 | do_action( 'wp_mail_failed', new WP_Error( 'wp_mail_failed', $e->getMessage(), $mail_error_data ) ); |
| 486 | |
| 487 | return false; |
| 488 | } |
| 489 | } |
| 490 | endif; |
| 491 | |
| 492 | if ( !function_exists('wp_authenticate') ) : |
| 493 | /** |
| 494 | * Authenticate a user, confirming the login credentials are valid. |