在输入值中检索 $_SESSION 值 [英] Retrieve $_SESSION value in Input value
问题描述
我正在使用一个基本的注册表单，如果用户按下提交按钮，我想将输入值存储到会话中，并将相同的用户数据保留到输入字段中.使用以下代码，我可以临时存储和检索，但仅当我按两次提交按钮时.我的基本要求是- 我想在按下提交"后保留用户数据.- 我也想保留收音机，复选框值.- 即使我们刷新页面，也可以保留输入值.
I am working with a basic registration form , if the user presses submit button , i want to store the input values to a session and also to retain the same user data into the inputfield . With the following code i can able to temporarily store and retrieve but only when i press submit button twice. my basic requirements are - I want to retain the user data after pressing "submit". - I Want to retain the radio , checkbox values also. - It is possible to retain the input values even though we Refresh the page.
代码如下，请就我的问题提出一些建议
the code follows , please give some suggestion regarding my problem
<!DOCTYPE html>
<html>
<head>
<title>Registration</title>
<style type="text/css">
ul li
{
list-style:none;
}
form
{
border:1px solid #ccc;
width:500px;
margin:0 auto;
}
</style>
</head>
<body>
<?php session_start(); ?>
<form action="<?php $_PHP_SELF ?>" method="post" name="register" >
<h4>User Registration</h4>
<ul>
<li><label>User Name</label></li>
<li>
<input type="text" name="user" size="20" value="
<?php echo isset($_SESSION['user']) ? $_SESSION['user'] : ''; ?>"></li>
<li><label>Email</label></li>
<li><input type="text" name="email" size="25" value="
<?php echo isset($_SESSION['email']) ? $_SESSION['email'] : ''; ?>"></li>
<li>Gender</li>
<li><input type="radio" name="gender">Male</li>
<li><input type="radio" name="gender">Female</li>
<li>Computer Knowledge</li>
<li><input type="checkbox" name="c">C Language</li>
<li><input type="checkbox" name="cplus">C++ Language</li>
<li><input type="checkbox" name="java">Java</li>
<li><input type="checkbox" name="php">PHP</li>
<li><input type="checkbox" name="python">python</li>
<li><input type="submit" name="submit" value="submit">
</ul>
</form>
<?php
if (isset($_POST['submit']))
{
$_SESSION['user'] = $_POST['user'];
$_SESSION['email'] = $_POST['email'];
}
?>
</body>
</html>
提前致谢
推荐答案
将这部分移到脚本顶部，紧跟在 session_start(); 之后:
Move this part at the top of your script, just after session_start(); :
<?php
if (isset($_POST['submit']))
{
$_SESSION['user'] = $_POST['user'];
$_SESSION['email'] = $_POST['email'];
}
?>
此外，正如@pythonian29033 所说，session_start(); 应该在输出任何内容之前编写.
Also, as @pythonian29033 said, session_start(); should be written before you output any content.
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