action属性中设置查询字符串，method ='POST'，可是还是获取不到$flag的值

 <?php 
$flag=$_GET['flag'];    
if($flag=='1'){
    echo '欢迎'.$_POST['user'].'光临';
}else {
echo "<form method ='POST' action='?$flag=1'>
姓名：<input name='user' type='text' size='15'/>
<input type='submit' value='提交'/></form>";}
?>

参数名搞错了，多了个$在前面

 echo "<form method ='POST' action='?flag=1'>

http://bbs.csdn.net/topics/392038546

?$flag=1 ????