致命错误：未捕获的错误：调用字符串 i 上的成员函数 bindParam()

Question

我正在尝试创建一个注册页面并成功创建它，并希望仅将其验证到一个电子邮件帐户，以便用户只能通过电子邮件创建一个帐户，下次它应该会给出一个错误，说你有已经注册了电子邮件帐户，但在跟踪中我收到一条错误消息，说正在休耕

Fatal error: Uncaught Error: Call to a member function bindParam() on string 
in C:\xampp\htdocs\sign\register.php:20 Stack trace: #0 {main} thrown in 
C:\xampp\htdocs\sign\register.php on line 20

而我的php注册码是fallows

<?php
include('connection.php');  
$form = $_POST;
$username = $form['username'];
$password = $form['password'];
$repass = $form['repass'];
$email = $form['email'];
$date = $form['date'];
$month = $form['month'];
$year = $form['year'];
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
echo "Invalid email please type a valid one"; 
}
else{
if($username !='' && $password !='' && $repass!='' && $email !='' && 
$date!='' && $month !='' && $year !='')
{
if($password == $repass)
{
$query = "SELECT * FROM users where email = :email AND username = 
:username";
$query->bindParam(':username',$username);
$query->bindParam(':email',$email);
$count1 = $query->rowCount();
if($count> 0)
{
    echo "soryy the email you are trying to register is already 
registered!";
}
else{

$insert = $connection->prepare("INSERT INTO users 
(username,password,email,date,month,year)  values (:username, :password, 
:email, :date, :month, :year)");
$insert->bindParam(':username',$username);
$insert->bindParam(':password',$password);
$insert->bindParam(':email',$email);
$insert->bindParam(':date',$date);
$insert->bindParam(':month',$month);
$insert->bindParam(':year',$year);
$out = $insert->execute();
if(isset($out)){
    echo "thankyou you have sucessfully registered";
}
else{
    echo " sorry some error occured please try again!";
}
} 
}
else{
echo " passwords do not match";
die();
}
}
else{
echo " you have not filled the registration form completely so please it";
}
}
?>

谁能帮我解决这个问题谢谢

Answer 1

你没有声明一个语句并直接绑定参数来查询使用这样的东西。

$select = $connection->prepare($query); 
$select->bindParam(':username',$username);

Answer 2

您必须在准备好的语句上绑定参数。将选择查询语句更改为

$query = $connection->prepare("SELECT * FROM users where email = :email AND username = 
:username");

编辑

要从选择查询中计算行数，请使用fetchColumn。此外，您正在为$count1 赋值并使用$count。所以使用相同的变量名

$count = $query->fetchColumn();
if($count> 0)
{
    echo "soryy the email you are trying to register is already 
registered!";
}