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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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467 | $content_type = 'text/plain'; |
468 |
|
469 | /** |
470 | * Filter the wp_mail() content type. |
471 | * |
472 | * @since 2.3.0 |
473 | * |
474 | * @param string $content_type Default wp_mail() content type. |
475 | */ |
476 | $content_type = apply_filters( 'wp_mail_content_type', $content_type ); |
477 |
|
478 | $phpmailer->ContentType = $content_type; |
479 |
|
480 | // Set whether it's plaintext, depending on $content_type |
481 | if ( 'text/html' == $content_type ) |
482 | $phpmailer->IsHTML( true ); |
483 |
|
484 | // If we don't have a charset from the input headers |
485 | if ( !isset( $charset ) ) |