php数组转换成json格式。

   {
           "touser":"OPENID",
           "template_id":"ngqIpbwh8bUfcSsECmogfXcV14J0tQlEpBO27izEYtY",
           "url":"http://weixin.qq.com/download",
           "data":{
                   "first": {
                       "value":"恭喜你购买成功！",
                       "color":"#173177"
                   },
                   "keynote1":{
                       "value":"巧克力",
                       "color":"#173177"
                   },
                   "keynote2": {
                       "value":"39.8元",
                       "color":"#173177"
                   },
                   "keynote3": {
                       "value":"2014年9月22日",
                       "color":"#173177"
                   },
                   "remark":{
                       "value":"欢迎再次购买！",
                       "color":"#173177"
                   }
           }
       }

public function settemplateMsg(){

        $templateID = "oCn07pNLLCgUP9KN4T34sCs69nIqrBgtuCtAdVWaHOg";
        $posttemepleUrl ="https://api.weixin.qq.com/cgi-bin/message/template/send?access_token=".$this->access_token;

        $postData = array();
        $postData['touser']= "o2Q4wtwk4NlLqy7QwTWG5vc8RVus";
        $postData['template_id']= $templateID;
        $postData['url']= "http://m.ancun.org/wxmsg/index.php/home/attention";

        $templArr= array();
        $templArr['first'] = array('value'=>'有美女给你发信息啦','color'=>'#173177');
        $templArr['keyword1'] = array('value'=>'明天你有时间吗。我要你出来一下。','color'=>'#173177');
        $templArr['keyword2'] = array('value'=>'存宝系统 ','color'=>'#173177');
        $templArr['keyword3'] = array('value'=>'王您码','color'=>'#173177');
        $templArr['keyword4'] = array('value'=>'2014年9月22日','color'=>'#173177');
        $templArr['remark'] = array('value'=>'欢迎再次使用。','color'=>'#173177');

        $postData['data']= $templArr;

        $postData = json_encode($postData);

        $result =  $this->http_request($posttemepleUrl,$postData);
        return json_decode($result,true);

    }