<?php
session_start();
if(isset($_SESSION['username'])){
?>
active user: <?php echo $_SESSION["username"];?>
<div class="form_row">
<a class="form1" href="logout.php">logout</a>
</div>
<?php }else {?>
<form action="check.php" method="post" name="myform" onsubmit="return Checklogin(this);">
<div class="form_row">
<label class="contact"><strong>username:</strong></label>
<input type="text" class="contact_input" name="username"/>
</div>
<div class="form_row">
<label class="contact"><strong>Password:</strong></label>
<input type="password" class="contact_input" name="password"/>
</div> <div class="form_row">
</div>
<div class="form_row">
<input type="submit" class="register" value="login" name="login"/><a href="register.php">register</a>
</div>
<?php }?>
session_start();
if(isset($_SESSION['username'])){
?>
active user: <?php echo $_SESSION["username"];?>
<div class="form_row">
<a class="form1" href="logout.php">logout</a>
</div>
<?php }else {?>
<form action="check.php" method="post" name="myform" onsubmit="return Checklogin(this);">
<div class="form_row">
<label class="contact"><strong>username:</strong></label>
<input type="text" class="contact_input" name="username"/>
</div>
<div class="form_row">
<label class="contact"><strong>Password:</strong></label>
<input type="password" class="contact_input" name="password"/>
</div> <div class="form_row">
</div>
<div class="form_row">
<input type="submit" class="register" value="login" name="login"/><a href="register.php">register</a>
</div>
<?php }?>
有没写入session啊?
检查一下