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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 |
|---|---|
| 1299 | * Filters the admin referrer policy header value. |
| 1300 | * |
| 1301 | * @since 4.9.0 |
| 1302 | * @since 4.9.5 The default value was changed to 'strict-origin-when-cross-origin'. |
| 1303 | * |
| 1304 | * @link https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Referrer-Policy |
| 1305 | * |
| 1306 | * @param string $policy The admin referrer policy header value. Default 'strict-origin-when-cross-origin'. |
| 1307 | */ |
| 1308 | $policy = apply_filters( 'admin_referrer_policy', $policy ); |
| 1309 | |
| 1310 | header( sprintf( 'Referrer-Policy: %s', $policy ) ); |
| 1311 | } |
| 1312 | |
| 1313 | /** |
| 1314 | * Outputs JS that reloads the page if the user navigated to it with the Back or Forward button. |
| 1315 | * |
| 1316 | * Used on the Edit Post and Add New Post screens. Needed to ensure the page is not loaded from browser cache, |
| 1317 | * so the post title and editor content are the last saved versions. Ideally this script should run first in the head. |