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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 |
|---|---|
| 1411 | * Filters an HTTP status header. |
| 1412 | * |
| 1413 | * @since 2.2.0 |
| 1414 | * |
| 1415 | * @param string $status_header HTTP status header. |
| 1416 | * @param int $code HTTP status code. |
| 1417 | * @param string $description Description for the status code. |
| 1418 | * @param string $protocol Server protocol. |
| 1419 | */ |
| 1420 | $status_header = apply_filters( 'status_header', $status_header, $code, $description, $protocol ); |
| 1421 | } |
| 1422 | |
| 1423 | if ( ! headers_sent() ) { |
| 1424 | header( $status_header, true, $code ); |
| 1425 | } |
| 1426 | } |
| 1427 | |
| 1428 | /** |
| 1429 | * Get the header information to prevent caching. |