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我了解会话。想问问是否有更多的方法来保存页面中的变量并在表单中分享。示例代码，这是不行的，因为我不知道如何共享varf1，varf2，在页面varf3不使用会话：在页面中保存变量并在表单之间共享它们的方法，不使用会话
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title></title>
<meta name="" content="">
</head>
<body>
<!-- Question: how to access variables varf1, varf2, varf3 in all three forms? -->
<!-- <?php $varf1= $_POST['varf1']; $varf2= $_POST['varf2']; $varf3= $_POST['varf3']; $_POST['fsn1']=""; $_POST['fsn2']=""; ?> -->
<?php $varf1=$_POST['varf1']=$varf2=$_POST['varf2']=$varf3=$_POST['varf3']=""; ?>
<!-- form1 generates form2, and form 2 generates form3 -->
<form name="form1" method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?> ">
<?php $varf1="varf1";
echo "in form1, var1=".$varf1.", var2=".$varf2.", var3=".$varf3; ?>
<input type="submit" id="fsi1" value="fsv1" name="fsn1"> <br>
</form>
<?php if($_SERVER["REQUEST_METHOD"] == "POST") {
if(!empty($_POST['fsn1'])) { ?>
<form name="form2" method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?> ">
<?php $varf2="varff2";
echo "in form2, var1=".$varf1.", var2=".$varf2.", var3=".$varf3; ?>
<input type="submit" id="fsi2" value="fsv2" name="fsn2">
</form><br>;
<?php } // if(!empty($_POST['fsn1'])
if(!empty($_POST['fsn2'])) { ?>
<form name="form3" method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?> ">
<?php $varf3="varff3";
echo "in form3, var1=".$varf1.", var2=".$varf2.", var3=".$varf3; ?>
<input type="submit" id="fsi3" value="fsv3" name="fsn3">
</form><br>;
<?php } // if(!empty($_POST['fsn2']))
} // if($_SERVER["REQUEST_METHOD"
?>
</body>
</html>