thinkphp3.2 where statement query

$res=$User->where('id="'.$id.'"')->save($data);public function caozuo(){<br>               $User = M('Info');<br>               $aid=$_GET['content'];<br>                $data = $User->field('content')->select();<br> <br>               $date['content']=$congt;<br>                $congt=$_GET['content'];<br>                 $reslut=$User->where('id="'.$id.'"')->save($data);<br>                 $this->assign('content',$data); // Template variable assignment<br>                    $this->display();<br> }Excuse me, how should I use this sentence? Can you give me an example?

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