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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 |
|---|---|
| 554 | * An array containing the email recipient(s), subject, message, headers, and attachments. |
| 555 | * |
| 556 | * @type string[] $to Email addresses to send message. |
| 557 | * @type string $subject Email subject. |
| 558 | * @type string $message Message contents. |
| 559 | * @type string[] $headers Additional headers. |
| 560 | * @type string[] $attachments Paths to files to attach. |
| 561 | * } |
| 562 | */ |
| 563 | do_action( 'wp_mail_succeeded', $mail_data ); |
| 564 | |
| 565 | return $send; |
| 566 | } catch ( PHPMailer\PHPMailer\Exception $e ) { |
| 567 | $mail_data['phpmailer_exception_code'] = $e->getCode(); |
| 568 | |
| 569 | /** |
| 570 | * Fires after a PHPMailer\PHPMailer\Exception is caught. |
| 571 | * |
| 572 | * @since 4.4.0 |