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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 |
|---|---|
| 416 | $content_type = 'text/plain'; |
| 417 | |
| 418 | /** |
| 419 | * Filter the wp_mail() content type. |
| 420 | * |
| 421 | * @since 2.3.0 |
| 422 | * |
| 423 | * @param string $content_type Default wp_mail() content type. |
| 424 | */ |
| 425 | $content_type = apply_filters( 'wp_mail_content_type', $content_type ); |
| 426 | |
| 427 | $phpmailer->ContentType = $content_type; |
| 428 | |
| 429 | // Set whether it's plaintext, depending on $content_type |
| 430 | if ( 'text/html' == $content_type ) |
| 431 | $phpmailer->IsHTML( true ); |
| 432 | |
| 433 | // If we don't have a charset from the input headers |
| 434 | if ( !isset( $charset ) ) |