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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 |
|---|---|
| 939 | * Filters the document title before it is generated. |
| 940 | * |
| 941 | * Passing a non-empty value will short-circuit wp_get_document_title(), |
| 942 | * returning that value instead. |
| 943 | * |
| 944 | * @since 4.4.0 |
| 945 | * |
| 946 | * @param string $title The document title. Default empty string. |
| 947 | */ |
| 948 | $title = apply_filters( 'pre_get_document_title', '' ); |
| 949 | if ( ! empty( $title ) ) { |
| 950 | return $title; |
| 951 | } |
| 952 | |
| 953 | global $page, $paged; |
| 954 | |
| 955 | $title = array( |
| 956 | 'title' => '', |
| 957 | ); |