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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 |
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475 |
|
476 | /** |
477 | * Fires after a phpmailerException is caught. |
478 | * |
479 | * @since 4.4.0 |
480 | * |
481 | * @param WP_Error $error A WP_Error object with the phpmailerException code, message, and an array |
482 | * containing the mail recipient, subject, message, headers, and attachments. |
483 | */ |
484 | do_action( 'wp_mail_failed', new WP_Error( $e->getCode(), $e->getMessage(), $mail_error_data ) ); |
485 |
|
486 | return false; |
487 | } |
488 | } |
489 | endif; |
490 |
|
491 | if ( !function_exists('wp_authenticate') ) : |
492 | /** |
493 | * Authenticate a user, confirming the login credentials are valid. |