配置好restful api，使用postman调试get，返回数据问题 [ 2.0 版本 ]

<?php[{"id":1,"username":"jack","auth_key":"VqPUSe9qDclF9qcxmJmEGvHw-4AsQnq6","password_hash":"$2y$13$XvZYx7eJZkUo6FfyhHYmAOj5Oys4nOo7PWFU2uxP9L8XfXMVpJLMm","password_reset_token":null,"email":"98694@qq.com","status":10,"created_at":1465188120,"updated_at":1465188120}]

为什么不是json格式，main.php我已经指定：

'request' => [
    'class' => '\yii\web\Request',
    'baseUrl' => '/manage',
    'enableCookieValidation' => false,
    'enableCsrfValidation' => false,
    'parsers' => [
        'application/json' => 'yii\web\JsonParser',
    ],
],

请问为什么多了<?php 标签呢？