我用file_get_contents('php://input');已经接收到两条表单传过来的json格式的数据，
[{"gwshezhijzgid":"2371","prgwdengjiid":"zw001","prgwdengji2id":"zw001","prdanweiid":"zw001","prtime":"20060205"},{"gwshezhijzgid":"2380","prgwdengjiid":"zw001","prgwdengji2id":"zw001","prdanweiid":"zw002","prtime":"20030521"}]{"message":"\u7f16\u53f7id\u4e0d\u80fd\u4e3a\u7a7a!","status":false}

但用$gwshezhijzgid = intval(I('Post.gwshezhijzgid'));
$prgwdengjiid = I('POST.prgwdengjiid');
却都接收不到，
我想把这两条信息都和数据库中根据gwshezhijzgid字段值更新其他四个字段，应该怎么写代码？