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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 |
---|---|
5985 | } |
5986 | } |
5987 |
|
5988 | // Set Content-Type if we don't have a content-type from the input headers. |
5989 | if ( ! isset( $content_type ) ) { |
5990 | $content_type = 'text/plain'; |
5991 | } |
5992 |
|
5993 | /** This filter is documented in wp-includes/pluggable.php */ |
5994 | $content_type = apply_filters( 'wp_mail_content_type', $content_type ); |
5995 |
|
5996 | if ( 'text/html' === $content_type ) { |
5997 | $mail['message'] = wp_staticize_emoji( $mail['message'] ); |
5998 | } |
5999 |
|
6000 | return $mail; |
6001 | } |
6002 |
|
6003 | /** |