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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 | ); |