它显示错误来自绑定,我真的不知道是什么问题,这个错误的解决方案是什么/
<?php
class DbOperation{
private $con;
function __construct(){
require_once dirname(__FILE__).'/DbConnect.php';
$db = new DbConnect();
$this->con = $db->connect();
}
function createUser($username,$pass,$email){
$password = md5($pass);
$stmt = $this->con->prepare("INSERT INTO `users` (`id`, `username`, `password`, `email`)
VALUES (NULL, ?, ?, ?)");
$stmt->bind_param("sss",$username,$password,$email);
if ($stmt->execute()) {
return true;
} else {
return false;
}
}
}