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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 |
|---|---|
| 1420 | * Filters the admin referrer policy header value. |
| 1421 | * |
| 1422 | * @since 4.9.0 |
| 1423 | * @since 4.9.5 The default value was changed to 'strict-origin-when-cross-origin'. |
| 1424 | * |
| 1425 | * @link https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Referrer-Policy |
| 1426 | * |
| 1427 | * @param string $policy The admin referrer policy header value. Default 'strict-origin-when-cross-origin'. |
| 1428 | */ |
| 1429 | $policy = apply_filters( 'admin_referrer_policy', $policy ); |
| 1430 | |
| 1431 | header( sprintf( 'Referrer-Policy: %s', $policy ) ); |
| 1432 | } |
| 1433 | |
| 1434 | /** |
| 1435 | * Outputs JS that reloads the page if the user navigated to it with the Back or Forward button. |
| 1436 | * |
| 1437 | * Used on the Edit Post and Add New Post screens. Needed to ensure the page is not loaded from browser cache, |
| 1438 | * so the post title and editor content are the last saved versions. Ideally this script should run first in the head. |