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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 |
|---|---|
| 393 | * Allows modification of the response data after inserting |
| 394 | * embedded data (if any) and before echoing the response data. |
| 395 | * |
| 396 | * @since 4.8.1 |
| 397 | * |
| 398 | * @param array $result Response data to send to the client. |
| 399 | * @param WP_REST_Server $this Server instance. |
| 400 | * @param WP_REST_Request $request Request used to generate the response. |
| 401 | */ |
| 402 | $result = apply_filters( 'rest_pre_echo_response', $result, $this, $request ); |
| 403 | |
| 404 | $result = wp_json_encode( $result ); |
| 405 | |
| 406 | $json_error_message = $this->get_json_last_error(); |
| 407 | if ( $json_error_message ) { |
| 408 | $json_error_obj = new WP_Error( 'rest_encode_error', $json_error_message, array( 'status' => 500 ) ); |
| 409 | $result = $this->error_to_response( $json_error_obj ); |
| 410 | $result = wp_json_encode( $result->data[0] ); |
| 411 | } |