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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 |
|---|---|
| 889 | * Note that this filter will not be called for requests that |
| 890 | * fail to authenticate or match to a registered route. |
| 891 | * |
| 892 | * @since 4.7.0 |
| 893 | * |
| 894 | * @param WP_HTTP_Response $response Result to send to the client. Usually a WP_REST_Response. |
| 895 | * @param WP_REST_Server $handler ResponseHandler instance (usually WP_REST_Server). |
| 896 | * @param WP_REST_Request $request Request used to generate the response. |
| 897 | */ |
| 898 | $response = apply_filters( 'rest_request_before_callbacks', $response, $handler, $request ); |
| 899 | |
| 900 | if ( ! is_wp_error( $response ) ) { |
| 901 | // Check permission specified on the route. |
| 902 | if ( ! empty( $handler['permission_callback'] ) ) { |
| 903 | $permission = call_user_func( $handler['permission_callback'], $request ); |
| 904 | |
| 905 | if ( is_wp_error( $permission ) ) { |
| 906 | $response = $permission; |
| 907 | } elseif ( false === $permission || null === $permission ) { |