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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 |
|---|---|
| 396 | $from_email = apply_filters( 'wp_mail_from', $from_email ); |
| 397 | |
| 398 | /** |
| 399 | * Filters the name to associate with the "from" email address. |
| 400 | * |
| 401 | * @since 2.3.0 |
| 402 | * |
| 403 | * @param string $from_name Name associated with the "from" email address. |
| 404 | */ |
| 405 | $from_name = apply_filters( 'wp_mail_from_name', $from_name ); |
| 406 | |
| 407 | try { |
| 408 | $phpmailer->setFrom( $from_email, $from_name, false ); |
| 409 | } catch ( PHPMailer\PHPMailer\Exception $e ) { |
| 410 | $mail_error_data = compact( 'to', 'subject', 'message', 'headers', 'attachments' ); |
| 411 | $mail_error_data['phpmailer_exception_code'] = $e->getCode(); |
| 412 | |
| 413 | /** This filter is documented in wp-includes/pluggable.php */ |
| 414 | do_action( 'wp_mail_failed', new WP_Error( 'wp_mail_failed', $e->getMessage(), $mail_error_data ) ); |