AJAX (tag)
| check_ajax_referer() | Verifies nonce token of an Ajax request. Kills PHP if the verification failed. By default searches for a nonce token in $_REQUEST['_ajax_nonce'] and $_REQUEST['_wpnonce']. |
| wp_doing_ajax() | Determines whether the current request is a WordPress Ajax request. |
| wp_json_encode() | Encode a variable into JSON, with some sanity checks. Checks strings and translates them to UTF-8. |
| wp_send_json() | Encodes the passed variable into JSON, prints the result to the screen and terminates the script (die). Used to return data for AJAX requests. |
| wp_send_json_error() | Send a JSON response back to an Ajax request, indicating failure. |
| wp_send_json_success() | Returns JSON data. Is used to return a success response to AJAX request. The response object always contains the element |