wp_is_jsonp_request

WordPress Version: 5.2

/**
 * Checks whether current request is a JSONP request, or is expecting a JSONP response.
 *
 * @since 5.2.0
 *
 * @return bool True if JSONP request, false otherwise.
 */
function wp_is_jsonp_request()
{
    if (!isset($_GET['_jsonp'])) {
        return false;
    }
    if (!function_exists('wp_check_jsonp_callback')) {
        require_once ABSPATH . WPINC . '/functions.php';
    }
    $jsonp_callback = $_GET['_jsonp'];
    if (!wp_check_jsonp_callback($jsonp_callback)) {
        return false;
    }
    /** This filter is documented in wp-includes/rest-api/class-wp-rest-server.php */
    $jsonp_enabled = apply_filters('rest_jsonp_enabled', true);
    return $jsonp_enabled;
}