Question

我创建了一个登录表单，我遇到了很多其他问题，现在我发现PHP代码正在执行之前提交。如何解决问题？由于PHP不支持onclick事件（无论如何都很糟糕！），我看不到任何我知道的解决方案！

代码：

//Get the form with POST
$user = mysql_real_escape_string($_POST['user']);
$password = mysql_real_escape_string($_POST['pass']);



$usernames=mysql_query("SELECT * FROM user_info WHERE Username='" . $_POST['user'] . "' AND Password='" . $_POST['pass'] . "'");
if(!$usernames){echo mysql_error();}

$count=mysql_num_rows($usernames);
if(!$count){echo mysql_error();}

//If $count is equal to one, register the user and redirect him to his page, or else   echo him that his info is wrong
if($count === 1) {
$_SESSION['code'] = "titan";
$_SESSION['ande'] = $user;
$_SESSION['password'] = $password;
header("location: home.php");}
else {
echo "<p style='color:red;text-align:center;'>Wrong username or password!</p>";}

Answer 1

在IF语句中将表单提交后应该执行的代码换行，以检查表单是否已提交：

if ('POST' === $_SERVER['REQUEST_METHOD'])
{
    // your code goes here
}

Answer 2

检查表单是否已提交

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

   //Your php code goes here

}

根据您的评论我延伸了这个答案

只需将所有代码置于您在问题中发送的条件

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

    //Get the form with POST
    $user = mysql_real_escape_string($_POST['user']);
    $password = mysql_real_escape_string($_POST['pass']);



    $usernames=mysql_query("SELECT * FROM user_info WHERE Username='" . $_POST['user'] . "' AND Password='" . $_POST['pass'] . "'");
    if(!$usernames){echo mysql_error();}

    $count=mysql_num_rows($usernames);
    if(!$count){echo mysql_error();}

    //If $count is equal to one, register the user and redirect him to his page, or else   echo him that his info is wrong
    if($count === 1) {
    $_SESSION['code'] = "titan";
    $_SESSION['ande'] = $user;
    $_SESSION['password'] = $password;
    header("location: home.php");}
    else {
    echo "<p style='color:red;text-align:center;'>Wrong username or password!</p>";}

}

Answer 3

我 DID NOT 告诉你的是PHP代码与表单和HTML的其余部分在同一个文件中...我试图用AJAX重新编写代码，（它没有' t work =（但它仍然有帮助！）为此我将PHP代码移到另一个文件（Login_engine.php）中。就是这样！当然，仍然存在一个小问题：现在，红色文本显示在Login_engine.php内......太糟糕了！

PHP代码在提交之前执行

3 个答案: