我正在尝试打印到屏幕的 phone SESSION 有什么问题？

Question

我正在测试 SESSION，其中前三页打印到最后一页。但是我很难让它工作。一切顺利，直到最后一页。这是代码：

<?php
session_start();

if (isset($_POST['submit'])) { 
$_SESSION['name'] = $_POST ['name'];
$_SESSION['email'] = $_POST ['email'];
$_SESSION['age'] = $_POST ['age'];

echo $_SESSION['name'];
echo $_SESSION['email'];
echo $_SESSION['age'];
}
?>

会话变量出现空白或索引错误。任何人都可以帮助以正确的方式打印用户输入的会话数据吗？

这是第 1、2、3 页：

<html>
<head>
<title>phpsession</title>
</head>
<body>
<form method="POST" action="test_2_page_1.php">
<input type="text" name="name" placeholder="enter name"></input>
<input type="submit"> next</input>
</form>
<?php
//Set session variables
if (isset($_POST['submit'])) { 
$_SESSION['name'] = $_POST ['name'];
}
?>
</body>
</html>


<?php
session_start();
if (isset($_POST['submit'])) { 
$_SESSION['name'] = $_POST ['name'];
$_SESSION['email'] = $_POST ['email'];
}
?>
<html>
<head>
<title>phpsession</title>
</head>
<body>
<form method="POST" action="test_2_page_2.php">
<input type="text" name="email" placeholder="enter email"></input>
<input type="submit"> next</input>
</form>
<?php
// Set session variables
?>
</body>
</html>


<?php
session_start();
if (isset($_POST['submit'])) { 
$_SESSION['name'] = $_POST ['name'];
$_SESSION['email'] = $_POST ['email'];
$_SESSION['age'] = $_POST ['age'];
}
?>
<html>
<head>
<title>phpsession</title>
</head>
<body>
<form method="POST" action="post_test.php">
<input type="text" name="age" placeholder="enter age"></input>
<input type="submit"> next</input>
</form>
<?php
// Set session variables
?>
</body>
</html>

Answer 1

您的 HTML 中没有名称为 submit 的输入元素，因此您的 PHP 代码的以下部分将始终计算为 false:

if (isset($_POST['submit'])) {

将 HTML 中的提交按钮更改为以下内容，当发布表单时，上面的行将计算为 true：

<input name="submit" type="submit"> next</input>

Answer 2

input 元素是 self-closing，因为您不需要 </input> - 标签只是使用 />

关闭

要将 Next 显示为提交按钮，您可以使用值属性 - 即：<input type='submit' value='Next' />

分配会话变量后，您无需继续尝试设置它，如果变量在 POST 数组中不可用，将会遇到错误 - 因此请使用 isset 进行测试创建变量

<?php
    session_start();
    if ( isset( $_POST['submit'], $_POST['name'] ) ) { 
        $_SESSION['name'] = $_POST['name'];
    }   
?>
<html>
    <head>
        <title>phpsession</title>
    </head>
    <body>
        <form method="POST" action="test_2_page_1.php">
            <input type="text" name="name" placeholder="enter name" />
            <input type="submit" name='submit' value='Next'>
        </form>
    </body>
</html>





<?php
    session_start();
    if ( isset( $_POST['submit'], $_POST['email'] ) ) {
        $_SESSION['email'] = $_POST['email'];
    }
?>
<html>
    <head>
        <title>phpsession</title>
    </head>
    <body>
        <form method="POST" action="test_2_page_2.php">
            <input type="text" name="email" placeholder="enter email" />
            <input type="submit" name='submit' value='Next'>
        </form>
    </body>
</html>







<?php
    session_start();
    if( isset( $_POST['submit'],$_POST['age'] ) ) {
        $_SESSION['age'] = $_POST['age'];
    }
?>
<html>
    <head>
        <title>phpsession</title>
    </head>
    <body>
        <form method="POST" action="post_test.php">
            <input type="text" name="age" placeholder="enter age" />
            <input type="submit" name='submit' value='Next'>
        </form>
    </body>
</html>

为了进一步帮助您解决问题，我快速整理了一个基于表单提交获取和设置会话变量的单页演示。希望对您有所帮助

<?php
    session_start();
    #

    if( !empty( $_GET['reset'] ) ){
        unset( $_SESSION['name'] );
        unset( $_SESSION['email'] );
        unset( $_SESSION['age'] );
        header( sprintf('Location: %s', $_SERVER['SCRIPT_NAME'] ) );
    }

    /* 
        as each form only submits two values ( submit being one ) we can
        simply remove it from the POST array and use the remaining field/value
        to generate the session variables using simple array techniques

        The below could easily be replaced with pre-defined variables, such as:
        if( isset( $_POST['name'] ) )$_SESSION['name']=$_POST['name']; etc

    */
    if ( isset( $_POST['submit'] ) ) {
        /* remove the submit button & value from the array */
        unset( $_POST['submit'] );

        /* there will now be one item, with index = 0 */
        $keys=array_keys( $_POST );
        $values=array_values( $_POST );

        /* set the session variable */
        $_SESSION[ $keys[0] ]=$values[0];
    }

?>
<html>
    <head>
        <title>phpsession</title>
    </head>
    <body>
        <form method='POST'>
        <?php
            if( empty( $_SESSION['name'] ) ){
                echo "<input type='text' name='name' placeholder='enter name' />";
            }
            if( !empty( $_SESSION['name'] ) && empty( $_SESSION['email'] ) ){
                echo "<input type='text' name='email' placeholder='enter email address' />";
            }
            if( !empty( $_SESSION['name'] ) && !empty( $_SESSION['email'] ) && empty( $_SESSION['age'] ) ){
                echo "<input type='text' name='age' placeholder='enter your age' />";
            }
            if( empty( $_SESSION['age'] ) ){
                echo "<input type='submit' name='submit' value='Next'>";
            } else {
                if( empty( $_POST['finish'] ) ) echo "<input type='submit' name='finish' value='Finish'>";
            }
            if( isset( $_POST['finish'] ) ){
                /* 
                    Once the user has completed each form, send them off to their final destination?
                    or do something else....
                */
                printf(
                    'Do some interesting stuff now ....
                    <pre>%s</pre><a href="?reset=true">Reset</a>',
                    print_r( $_SESSION, true )
                );
            }
        ?>
        </form>
    </body>
</html>

我正在尝试打印到屏幕的 phone SESSION 有什么问题？

What am I doing wrong with this phone SESSION I'm trying to print to screen?

php

session

post

session-variables