A JSend compliant JSONResponse class. https://labs.omniti.com/labs/jsend

JSONResponse.php

<?php

class JSONResponse implements JSend, Sendable
{
    private $data;

    public function error($message, $code = 0, $data = null)
    {
        $this->data = array(
            'status' => self::STATUS_ERROR,
            'data' => $data,
            'message' => $message
        );

        if ($code > 0) {
            $this->data['code'] = (int) $code;
        }
    }

    public function fail($data)
    {
        $this->data = array(
            'status' => self::STATUS_FAIL,
            'data' => $data
        );
    }

    public function success($data = null)
    {
        $this->data = array(
            'status' => self::STATUS_SUCCESS,
            'data' => $data
        );
    }

    public function send()
    {
        if (isset($this->data)) {
            header('Content-Type: application/json');
            die(json_encode($this->data));
        } else {
            throw new \LogicException("Cannot send an empty response.");
        }
    }
}

interface JSend
{
    const STATUS_SUCCESS = 'success';
    const STATUS_FAIL = 'fail';
    const STATUS_ERROR = 'error';

    public function error($message, $code = 0, $data = null);
    public function fail($data);
    public function success($message);
}

interface Sendable
{
    public function send();
}