Question

我正在测试一个SESSION，在此之前的前三页将打印到最后一页。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'];
}
?>

我在会话变量中出现空白或索引错误。谁能以正确的方式打印用户输入的会话数据？

这些是第一页，第二页和第三页：

<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

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

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

将HTML中的“提交”按钮更改为以下内容，发布表单后，上面的行将评估为true：

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

Answer 2

input元素是self-closing，因为您不需要</input>-只需使用/>

关闭标签

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

分配了会话变量后，您无需继续尝试设置它，并且如果该变量在POST数组中不可用，则会遇到错误-因此请在创建变量之前使用isset进行测试

<?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，我快速整理了一个页面演示，该演示基于表单提交来获取和设置会话变量。希望对您有帮助

<?php
    session_start();
    #https://stackoverflow.com/questions/54194496/what-am-i-doing-wrong-with-this-phone-session-im-trying-to-print-to-screen/54194890?noredirect=1#comment95217192_54194890

    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上的此手机会话有什么问题？

2 个答案: