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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 |
|---|---|
| 1125 | * fail to authenticate or match to a registered route. |
| 1126 | * |
| 1127 | * @since 4.7.0 |
| 1128 | * |
| 1129 | * @param WP_REST_Response|WP_HTTP_Response|WP_Error|mixed $response Result to send to the client. |
| 1130 | * Usually a WP_REST_Response or WP_Error. |
| 1131 | * @param array $handler Route handler used for the request. |
| 1132 | * @param WP_REST_Request $request Request used to generate the response. |
| 1133 | */ |
| 1134 | $response = apply_filters( 'rest_request_before_callbacks', $response, $handler, $request ); |
| 1135 | |
| 1136 | // Check permission specified on the route. |
| 1137 | if ( ! is_wp_error( $response ) && ! empty( $handler['permission_callback'] ) ) { |
| 1138 | $permission = call_user_func( $handler['permission_callback'], $request ); |
| 1139 | |
| 1140 | if ( is_wp_error( $permission ) ) { |
| 1141 | $response = $permission; |
| 1142 | } elseif ( false === $permission || null === $permission ) { |
| 1143 | $response = new WP_Error( |