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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 |
|---|---|
| 902 | * Note that this filter will not be called for requests that |
| 903 | * fail to authenticate or match to a registered route. |
| 904 | * |
| 905 | * @since 4.7.0 |
| 906 | * |
| 907 | * @param WP_HTTP_Response|WP_Error $response Result to send to the client. Usually a WP_REST_Response or WP_Error. |
| 908 | * @param array $handler Route handler used for the request. |
| 909 | * @param WP_REST_Request $request Request used to generate the response. |
| 910 | */ |
| 911 | $response = apply_filters( 'rest_request_before_callbacks', $response, $handler, $request ); |
| 912 | |
| 913 | if ( ! is_wp_error( $response ) ) { |
| 914 | // Check permission specified on the route. |
| 915 | if ( ! empty( $handler['permission_callback'] ) ) { |
| 916 | $permission = call_user_func( $handler['permission_callback'], $request ); |
| 917 | |
| 918 | if ( is_wp_error( $permission ) ) { |
| 919 | $response = $permission; |
| 920 | } elseif ( false === $permission || null === $permission ) { |