Question

我看到一些PHP课程，然后我主要通过实用的方式学习所以我的问题是非常新手，我不明白为什么这个代码不适用于注册时重复用户名的解决方案，每次我收到带头的问题< / p>

function signup($conn) {

    $uid = $_POST['uid'];
    $pwd = $_POST['pwd'];



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



        $query = mysql_query("select * from user where uid='$uid'");
        $encrypted_password = password_hash($pwd, PASSWORD_DEFAULT);
        if(mysql_num_rows(query)>0)
        {
             echo "<script> window.location.replace('test.php') </script>" ;

        }

        else {

        $sql = "insert into usi (uid, pwd)  values('$uid','$encrypted_password')";

        $result = $conn->query($sql);
        header("Location: test.php");




    }

}

}

Answer 1

这样：

$uid = $_POST['uid'];
$pwd = $_POST['pwd'];
if (isset($_POST['signupSubmit'])) {

应该是：

 if (isset($_POST['signupSubmit'])) {
     $uid = $_POST['uid'];
     $pwd = $_POST['pwd'];

我没有mysql_的解决方案，但这里是我制作的PDO示例，希望有所帮助

$dbhost = "localhost";
$dbname = "database";
$mysqlusr = "root";
$mysqlpass = "";

try {
    $db = new PDO("mysql:host={$dbhost};dbname={$dbname}", $mysqlusr, $mysqlpass);
    $db->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_WARNING);
    } 
    catch (PDOException $e){
        echo $e->getMessage();
    }

if(isset($_POST['signupSubmit'])){
    $uid = $_POST['uid'];
    $pwd = $_POST['pwd'];

    $encrypted_password = password_hash($pwd, PASSWORD_DEFAULT);

    try {
        $sql = "SELECT uid FROM user WHERE uid=:uid";           
        $statement = $db->prepare($sql);
        $statement->bindParam(':uid', $uid, PDO::PARAM_STR);
        $statement->execute();
        $result = $statement->fetch(PDO::FETCH_ASSOC);

        if (empty($result)) {
            try { 
                $sql = "INSERT INTO user (uid, pwd) VALUES (:uid, :pwd)";
                $statement = $db->prepare($sql);
                $statement->bindParam(':uid', $uid, PDO::PARAM_STR);
                $statement->bindParam(':pwd', $encrypted_password, PDO::PARAM_STR);
                $statement->execute();

                echo "new user registered";
             }
            catch (PDOException $e){
                echo $e->getMessage();
            }
        }
            else {

                echo "username already exists";
            }
    }
    catch (PDOException $e){
        echo $e->getMessage();
    }
}

重复用户名解决方案

1 个答案: