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<?php if($pwd=='123456'){}else{?>
<form method="post">
<input type="password" name="pwd" />
<input type="submit" value="确定" />
</form>
<?php exit();}?>
if (isset($_POST['pwd'])){
$pwd=$_POST['pwd'];
}else{
echo "null!";
}
if(isset($_POST['pwd'])){
$pwd = $_POST['pwd'];
}