没有生成 php 会话代码的输出答案

【问题标题】：no output for php session code being generated没有生成 php 会话代码的输出
【发布时间】：2015-06-18 15:34:33
【问题描述】：

我遇到了关于 PHP 会话的问题。此代码应显示感谢您注册以及相应的用户名和电子邮件 ID，但它没有显示任何内容！请帮帮我！

<?php
//initialize session data
session_start();
if(isset($_SERVER['username'])){
    echo "you are already logged in as: ".$_SERVER['username'];
}
elseif($_SERVER['REQUEST_METHOD' == 'POST']){
    if(!empty(trim($_POST['username'])) && !empty(trim($_POST['email']))){
        $uname = $_POST['username'];
        $email = $_POST['email'];
        echo "thanks for registering <br/>";
        echo "your username: $uname <br/>";
        echo "your email: $email <br/>";
    }
    else{
        echo "please fill both the fields properly";
    }
}
else{ ?>
<form action="index.html?username=overwritten" method="POST">
    <input type="text" placeholder="username here.." name="username"><br/>
    <input type="email" placeholder="email here.." name="email"><br/>
    <input type="submit" value="register">
</form>
<?php } 
?>

它还显示：注意：未定义的偏移量：第 7 行 /Applications/XAMPP/xamppfiles/htdocs/samiary.com/index.php 中的 0 在顶端请帮帮我，我只是一个初学者。

【问题讨论】：

我想你需要$_SERVER['username']而不是$_SESSION['username']

标签： session session-variables

【解决方案1】：

$_SERVER['REQUEST_METHOD'] 附近有错误。试试这个：

<?php
//initialize session data
session_start();
if(isset($_SERVER['username'])){
    echo "you are already logged in as: ".$_SERVER['username'];
}
elseif($_SERVER['REQUEST_METHOD'] == 'POST'){
    if(!empty(trim($_POST['username'])) && !empty(trim($_POST['email']))){
        $uname = $_POST['username'];
        $email = $_POST['email'];
        echo "thanks for registering <br/>";
        echo "your username: $uname <br/>";
        echo "your email: $email <br/>";
    }
    else{
        echo "please fill both the fields properly";
    }
}
else{ ?>
<form action="" method="POST">
    <input type="text" placeholder="username here.." name="username"><br/>
    <input type="email" placeholder="email here.." name="email"><br/>
    <input type="submit" value="register">
</form>
<?php } 
?>

【讨论】：