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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 |
|---|---|
| 989 | * Filter an HTTP status header. |
| 990 | * |
| 991 | * @since 2.2.0 |
| 992 | * |
| 993 | * @param string $status_header HTTP status header. |
| 994 | * @param int $code HTTP status code. |
| 995 | * @param string $description Description for the status code. |
| 996 | * @param string $protocol Server protocol. |
| 997 | */ |
| 998 | $status_header = apply_filters( 'status_header', $status_header, $code, $description, $protocol ); |
| 999 | |
| 1000 | @header( $status_header, true, $code ); |
| 1001 | } |
| 1002 | |
| 1003 | /** |
| 1004 | * Get the header information to prevent caching. |
| 1005 | * |
| 1006 | * The several different headers cover the different ways cache prevention |
| 1007 | * is handled by different browsers |