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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 |
---|---|
5702 | } |
5703 | } |
5704 |
|
5705 | // Set Content-Type if we don't have a content-type from the input headers. |
5706 | if ( ! isset( $content_type ) ) { |
5707 | $content_type = 'text/plain'; |
5708 | } |
5709 |
|
5710 | /** This filter is documented in wp-includes/pluggable.php */ |
5711 | $content_type = apply_filters( 'wp_mail_content_type', $content_type ); |
5712 |
|
5713 | if ( 'text/html' === $content_type ) { |
5714 | $mail['message'] = wp_staticize_emoji( $mail['message'] ); |
5715 | } |
5716 |
|
5717 | return $mail; |
5718 | } |
5719 |
|
5720 | /** |