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我在写一个有3页的程序。如何保持具有表单的页面之间的会话变量？
在第1页上，用户可以选择一定数量的他想要购买的早餐产品。选择一个数量后，用户点击提交按钮，如果用户没有注册，他会让他去注册。如果用户已经注册，它将引导他们到第3页。然而，如果用户首先进入第2页并且没有从第1页中选择的数量，那么他将在他注册和按下后将他重定向到第1页提交，然后一旦他们选择一个数量，并在第一页点击提交它会去第3页。我很努力维护我的会话变量之间的页面，因为他们有两个表格，如果用户覆盖永远回到那个页面。
第1页：
<?php
session_start();
$_SESSION['name']= $_POST['name'];
$_SESSION['email']= $_POST['email'];
$platter_quantity = $_SESSION['platter_quantity'];
$yogurt_quantity = $_SESSION['yogurt_quantity'];
$waffles_quantity = $_SESSION['waffles_quantity'];
?>
<!DOCTYPE html>
<head>
<title>Product Page</title>
<link rel="stylesheet" type"text/css" href="settings.css">
</head>
<html>
<body>
<ul>
<li><a class="active" href="product.php">Product</a></li>
<li><a href="registration.php">Registration</a></li>
<li><a href="invoice.php">Invoice</a></li>
<li style="float:right"><a href="registration.php">Login</a></li>
</ul>
<?php
$action = '';
if (!empty($_SESSION['name']) or !empty($_SESSION['email'])) {
$action = "invoice.php";
}
else {
$action = "registration.php";
}
?>
<form action="<?php echo $action; ?>" method="post">
<div class="container">
<img src="images/platter.jpg" alt="Breakfast Platter" style="float: left; width: 400px; height: 300px;";>
<h1>Breakfast Platter</p>
<p>The breakfast platter option comes with two fried eggs, four pancakes, and a bunch of bacon.</p>
Quantity: <input type="number" name="platter_quantity" min="0">
<p value="10.99" name="platter_price">Price: $10.99</p>
</div>
<div class="container">
<img src="images/yogurt.jpg" alt="Yogurt Parfait" style="float: left; width: 400px; height: 300px;">
<h1>Yogurt Parfait</p>
<p>The yogurt parfait option comes with two cups of yogurt, oats, and a mixture of berries.</p>
Quantity: <input type="number" name="yogurt_quantity" min="0">
<p value="6.99" name="yogurt_price">Price: $6.99</p>
</div>
<div class="container">
<img src="images/waffles.jpg" alt="Waffles" style="float: left; width: 400px; height: 300px;";>
<h1>Waffles</p>
<p>The waffles option comes with two buttermilk waffles with butter and syrup.</p>
Quantity: <input type="number" name="waffles_quantity" min="0">
<p value="$4.99" name="waffles_price">Price: $4.99</p>
</div>
<br>
<button class="button" type="submit" name="submit">Submit</button>
</form>
</body>
</html>
第2页：
<?php
session_start();
$name = $_SESSION['name'];
$email = $_SESSION['email'];
$_SESSION['platter_quantity'] = $_POST['platter_quantity'];
$_SESSION['yogurt_quantity'] = $_POST['yogurt_quantity'];
$_SESSION['waffles_quantity'] = $_POST['waffles_quantity'];
?>
<!DOCTYPE html>
<head>
<title>Registration Page</title>
<link rel="stylesheet" type"text/css" href="settings.css">
</head>
<html>
<body>
<ul>
<li><a href="product.php">Product</a></li>
<li><a class="active" href="registration.php">Registration</a></li>
<li><a href="invoice.php">Invoice</a></li>
<li style="float:right"><a href="registration.php">Login</a></li>
</ul>
<br>
<?php
$action = '';
if (!empty($_SESSION['platter_quantity']) or !empty($_SESSION['yogurt_quantity']) or !empty($_SESSION['waffles_quantity'])) {
$action = "invoice.php";
}
else {
$action = "product.php";
}
?>
<form action="<?php echo $action; ?>" method="post">
Name: <input type="text" name="name" pattern="[A-Za-z]" required><br><br>
E-mail: <input type="text" name="email" pattern="/^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-][email protected][a-zA-Z0-9-]+(?:\.[a-zA-Z0-9-]+)*$/" required><br><br>
<input type="submit">
</form>
<br>
<?php
print_r($_SESSION);
echo "<br>Platter: " . $_SESSION["platter_quantity"] . "<br>";
echo "Yogurt: " . $_SESSION["yogurt_quantity"] . "<br>";
echo "Waffles: " . $_SESSION["waffles_quantity"];
?>
</body>
</html>
第3页：
<?php
session_start();
$name = $_SESSION['name'];
$email = $_SESSION['email'];
$platter_quantity = $_SESSION['platter_quantity'];
$yogurt_quantity = $_SESSION['yogurt_quantity'];
$waffles_quantity = $_SESSION['waffles_quantity'];
?>
<!DOCTYPE html>
<head>
<title>Invoice Page</title>
<link rel="stylesheet" type"text/css" href="settings.css">
</head>
<html>
<body>
<ul>
<li><a href="product.php">Product</a></li>
<li><a href="registration.php">Registration</a></li>
<li><a class="active" href="invoice.php">Invoice</a></li>
<li style="float:right"><a href="registration.php">Login</a></li>
</ul>
<h1>Hi! Welcome <?php echo $_SESSION['name']; ?>! </h1>
<?php
print_r($_SESSION);
echo "<br>Platter: " . $platter_quantity . "<br>";
echo "Yogurt: " . $yogurt_quantity . "<br>";
echo "Waffles: " . $waffles_quantity;
?>
</body>
</html>
什么是对我实施这一使用会话变量，而无需使用数据库的最佳方式？
我试着这样做的很好，但它似乎没有工作：
<?php
session_start();
if (empty($_SESSION['name']) or empty($_SESSION['email'])) {
$_SESSION['name'] = $POST_['name'];
$_SESSION['email'] = $POST_['email'];
}
else {
$name = $_SESSION['name'];
$name = $_SESSION['email'];
}
if (empty($_SESSION['platter_quantity']) or empty($_SESSION['yogurt_quantity']) or ($_SESSION['waffles_quantity'])) {
$_SESSION['platter_quantity'] = $POST_['platter_quantity'];
$_SESSION['yogurt_quantity'] = $POST_['yogurt_quantity'];
$_SESSION['waffles_quantity'] = $POST_['waffles_quantity'];
}
else {
$platter_quantity = $_SESSION['platter_quantity'];
$yogurt_quantity = $_SESSION['yogurt_quantity'];
$waffles_quantity = $_SESSION['waffles_quantity'];
}
?>
也许检查在覆盖之前它是否为空？ 'if（empty（$ _ SESSION ['name']））$ _SESSION ['name'] = $ _POST ['name'];' –
我试过这样做，它似乎并没有保存会话变量现在。 – ChaCol
我能否创建一个空白页面来保存表单会话变量，然后将它们重定向到相应的页面？我认为这将允许我分配会话变量而不会覆盖它们。 – ChaCol