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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 |
---|---|
4758 | } |
4759 | } |
4760 |
|
4761 | // Set Content-Type if we don't have a content-type from the input headers. |
4762 | if ( ! isset( $content_type ) ) { |
4763 | $content_type = 'text/plain'; |
4764 | } |
4765 |
|
4766 | /** This filter is documented in wp-includes/pluggable.php */ |
4767 | $content_type = apply_filters( 'wp_mail_content_type', $content_type ); |
4768 |
|
4769 | if ( 'text/html' === $content_type ) { |
4770 | $mail['message'] = wp_staticize_emoji( $mail['message'] ); |
4771 | } |
4772 |
|
4773 | return $mail; |
4774 | } |
4775 |
|
4776 | /** |