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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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460 | } |
461 |
|
462 | /** |
463 | * Filters the wp_mail() content type. |
464 | * |
465 | * @since 2.3.0 |
466 | * |
467 | * @param string $content_type Default wp_mail() content type. |
468 | */ |
469 | $content_type = apply_filters( 'wp_mail_content_type', $content_type ); |
470 |
|
471 | $phpmailer->ContentType = $content_type; |
472 |
|
473 | // Set whether it's plaintext, depending on $content_type. |
474 | if ( 'text/html' === $content_type ) { |
475 | $phpmailer->isHTML( true ); |
476 | } |
477 |
|
478 | // If we don't have a charset from the input headers. |