php - PDO 提交重复记录？

Question

我的注册码有效，但每次都重复提交。例如，如果我尝试提交

史蒂夫·史密斯 stevesmith@gmail.com 123456789

它会在数据库中出现两次，像这样

史蒂夫·史密斯 stevesmith@gmail.com 123456789

史蒂夫·史密斯 stevesmith@gmail.com 123456789

这是我的代码

$failed         = "<p class='errormsg'>Registration failed!</p>";
$register       = "<p class='errormsg'>Thank you for registering $firstname $lastname</p>";
$adduser = $con->prepare("INSERT INTO basicuserinfo(email, password, firstname, lastname) VALUES(:email, :password, :firstname, :lastname)");
$adduser->bindValue(':email', $email);
$adduser->bindValue(':password', $hash);
$adduser->bindValue(':firstname', $firstname);
$adduser->bindValue(':lastname', $lastname);
$adduser->execute();
    if(!$adduser->execute())
    {
    echo "$failed";
    }
    else
    {
    echo "$register";
    }
}

Answer 1

因为你调用了两次execute，删除第一个execute，

$failed         = "<p class='errormsg'>Registration failed!</p>";
$register       = "<p class='errormsg'>Thank you for registering $firstname $lastname</p>";
$adduser = $con->prepare("INSERT INTO basicuserinfo(email, password, firstname, lastname) VALUES(:email, :password, :firstname, :lastname)");
$adduser->bindValue(':email', $email);
$adduser->bindValue(':password', $hash);
$adduser->bindValue(':firstname', $firstname);
$adduser->bindValue(':lastname', $lastname);
// $adduser->execute();    // <<== this should be removed,
                           //  the reason for duplicate records
    if(!$adduser->execute())
    {
       echo "$failed";
    }
    else
    {
       echo "$register";
    }