php - 为什么我的 PHP 总是出现 500 错误？

Question

我正在尝试创建一个帐户注册页面，当我添加一个系统来检查数据库并确保没有多个行具有相同的用户名时，我收到了 500 错误。

这是有效的代码:

<?php


if(isset ($_POST['submit']))
{
    include( 'connection.php' );

    $username = $_POST['username'];
    $password = $_POST['password'];
    $email = $_POST['email'];

    if(empty($username) || empty($email) || empty($password))
    {
        echo 'Please check the required fields.';
    }
    elseif(!filter_var($email,FILTER_VALIDATE_EMAIL))
    {
        echo 'Please enter a correct email address.';
    }
    else
    {
        $password = md5($password);
        $sql = mysql_query("INSERT INTO users (email,username,password) VALUES ('$email','$username','$password')") or die(mysql_error());

        if($sql)
        {
            echo 'Successfully submitted.';
        }
    }   
}
?>

这是给我一个 500 错误的代码:

<?php
error_reporting(E_ALL)

if(isset ($_POST['submit'])) {
    include( 'connection.php' );

    $username = $_POST['username'];
    $password = $_POST['password'];
    $email = $_POST['email'];

    $fetch = mysql_query("SELECT * FROM users WHERE username = '$email'") or die(mysql_error();
    $num_rows = mysql_num_rows($fetch);

    if(empty($username) || empty($email) || empty($password)) {
        echo 'Please check the required fields.';
    }
    elseif(!filter_var($email,FILTER_VALIDATE_EMAIL)) {
        echo 'Please enter a correct email address.';
    }

    elseif($num_rows >= 1);
    {
        echo 'This username is taken.';

    else    
    }
        $password = md5($password);
        $sql = mysql_query("INSERT INTO users (email,username,password) VALUES ('$email','$username','$password')") or die(mysql_error());

        if($sql)
        {
            echo 'Successfully submitted.';
        }
    }   
}
?>

Answer 1

也许加一个分号:

error_reporting(E_ALL);

编辑:

你还缺少一个 ) on die(mysql_error();

从 elseif($num_rows >= 1); 中删除 ;

然后将您的 else block 修改为 } else {