Php 试图为我的表单设置唯一的条目

所以我搜索了这个问题并找到了类似的问题，但我不确定如何将他们的解决方案转换成我的解决方案——主要是因为我是PHP的noob。我正在努力。请容忍我。我感谢你的帮助

现在，我正在尝试这样做，以便我的表单不允许phpmysql中的电子邮件列出现重复条目。到目前为止，我进入了结构选项卡，并使其独特。差不多是中提琴。但是，我希望在提交表单时，错误消息显示在同一页面上，而不是重新加载表单并给出消息。另外，我想自定义消息。由于这是一个与phpmysql相关的错误，我不确定我是否会使用PHP编码，或者在其中的某个地方这样做

谢谢各位。我感谢你的帮助

<?php

function checkField($v){
    return (isset($v) && $v === false) ? true: false;
}
function startMysql(){
    $con=mysqli_connect("localhost", "shiftedr_admin", "passwerd", "shiftedr_whosthedeeusers"); 
    // Check connection
    if (mysqli_connect_errno()){
        echo "Failed to connect to MySQL: " . mysqli_connect_error();
    } else {
        return null;
    }
    return $con;
}
//  function closeMySql($connection){
//      mysqli_close($connection);
//  }
function formcheck(){
    $con=mysqli_connect("localhost", "shiftedr_admin", "shithead1", "shiftedr_whosthedeeusers"); 
    // Check connection
    if (mysqli_connect_errno()){
        echo "Failed to connect to MySQL: " . mysqli_connect_error();
    } else { 
        if (isset($_POST['submitted'])){

            $form = null;
            if (empty($_POST['fullname'])){
                $form['fullnameflag'] = false;
            } 
            if (empty($_POST['email'])){
                $form['emailflag'] = false;
            } 
            if (empty($_POST['password'])){
                $form['passwordflag'] = false;
            } 
            if (empty($_POST['pwc'])){
                $form['pwcflag'] = false;
            } 
            if (empty($_POST['userbday'])){
                $form['userbday'] = false;
            }
            if (empty($_POST['gender'])){
                $form['genderflag'] = false;
            } 
            if ($_POST['password'] != $_POST['pwc']){
                $form['fixpasswordconfirm'] = false;
            }


            /*$query = mysql_query ("SELECT * FROM users2  WHERE email = '". Email'" ."'");
          if (mysql_num_rows($query) > 0) 
            { 
 echo 'Email Address is Already In Use.'; 
            }*/

            if (empty($form)) { // all fields correct at this point, do database stuff
                $sql="INSERT INTO Users2 (fullname, Email, Password, userbday, Gender) VALUES ('".$_POST['fullname']."','".$_POST['email']."','".$_POST['password']."','".$_POST['userbday']."','".$_POST['gender']."')";
                if (!mysqli_query($con,$sql)){
                    die('Error: ' . mysqli_error($con));
                }
                echo "1 record added";
            }
        }
        mysqli_close($con);
        return $form;
    }
}

//// /  include("myfunctions.php");
?>

---

我猜您有两个页面-myform.php和process.php或类似的页面，所以请尝试这样做

<?php

$error = null; 

if( isset( $_POST['submitted'] ) ) // Same as your check is submitting if
{
    // Below is an example fail
    if( empty( $_POST['fullname'] ) ) $error = 1;

    // So for the email address failing you would put
    if( mysql_num_rows($query) > 0 ) $error = 2;

    if(! $error )
    {
        // all good no errors here so do database stuff....
    }
    else
    {
    header("Location: form.php?error=$error"); // return the error code to previous page
    }
}

?>



其中一个可能是空字段，或者可能是全名为空，两个是电子邮件地址或类似的内容，并且在myform.php页面上有

 <?php

if( isset( $_GET['error'] ) )
{
    switch ( $_GET['error'] )
    {
        case 1 : echo "One of the fields is empty"; break;

        case 2 : echo "Your email address has already been used"; break;

        default : echo "Unknown error occured";
    }
}

?>


“我希望错误消息显示在同一页上…”-您需要使用Ajax。看起来我正在深入兔子洞…是的！当您开始希望在同一页面上显示内容时，PHP本身无法完成全部工作。