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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 |
|---|---|
| 469 | } |
| 470 | |
| 471 | /** |
| 472 | * Filters the wp_mail() content type. |
| 473 | * |
| 474 | * @since 2.3.0 |
| 475 | * |
| 476 | * @param string $content_type Default wp_mail() content type. |
| 477 | */ |
| 478 | $content_type = apply_filters( 'wp_mail_content_type', $content_type ); |
| 479 | |
| 480 | $phpmailer->ContentType = $content_type; |
| 481 | |
| 482 | // Set whether it's plaintext, depending on $content_type. |
| 483 | if ( 'text/html' === $content_type ) { |
| 484 | $phpmailer->isHTML( true ); |
| 485 | } |
| 486 | |
| 487 | // If we don't have a charset from the input headers. |