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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 |
---|---|
830 | * Filter the document title before it is generated. |
831 | * |
832 | * Passing a non-empty value will short-circuit wp_get_document_title(), |
833 | * returning that value instead. |
834 | * |
835 | * @since 4.4.0 |
836 | * |
837 | * @param string $title The document title. Default empty string. |
838 | */ |
839 | $title = apply_filters( 'pre_get_document_title', '' ); |
840 | if ( ! empty( $title ) ) { |
841 | return $title; |
842 | } |
843 |
|
844 | global $page, $paged; |
845 |
|
846 | $title = array( |
847 | 'title' => '', |
848 | ); |