问题
I am trying to make a loginsystem with localhost server in xampp and phpmyadmin but the mysqli statement is somehow showing error. Ps I am new to this, So if this is some silly mistake ,sorry.
When i enter the details for registeration form The sql error header beacuse the mysqli statement didnt run properly
Here is the code of my signup.php file
<?php
if(isset($_POST['register'])){
include_once 'dph.php';
$first=$_POST['first'];
$last=$_POST['last'];
$username= $_POST['username'];
$password= $_POST['password'];
$email= $_POST['email'];
if(empty($username)||empty($password)||empty($email)||empty($first)||empty($last)){
header("Location:../register.php?signup=emptyfields");
exit();
}
elseif(!filter_var($email,FILTER_VALIDATE_EMAIL) && !preg_match("/^[a-zA-Z0-9]*$/",$username)){
header("Location:../register.php?signup=invalid&usernameor&email");
}
elseif(!filter_var($email,FILTER_VALIDATE_EMAIL))
{
header("Location:../register.php?signup=invalidemail&username=",$username);
exit();
}
elseif(!preg_match("/^[a-zA-Z0-9]*$/",$username)){
header("Location:../register.php?signup=invalidusername&email=",$email);
exit();
}
else{
$sql = "SELECT userUid FROM users WHERE userUid=?";
$stmt = mysqli_stmt_init($conn);
if(!mysqli_stmt_prepare($stmt, $sql)){
header("Location:../register.php?signup=sqlerror1"); //right here this part
exit();
}
else{
mysqli_stmt_bind_param($stmt,"s",$username);
mysqli_stmt_execute($stmt);
mysqli_stmt_store_result($stmt);
$resultCheck=mysqli_stmt_num_rows($stmt);
if($resultCheck >0){
header("Location:../register.php?signup=usernametaken&email=",$email);
exit();
}
else{
$sql="INSERT INTO users(userFirst,userLast,userEmail,userUid,userPwd) VALUES(?,?,?,?,?)";
$stmt =mysqli_stmt_init($conn);
if(!mysqli_stmt_prepare($stmt,$sql)){
header("Location:../register.php?signup=sqlerror2");
exit();
}
else{
$hashedPwd = password_hash($password,PASSWORD_DEFAULT);
mysqli_stmt_bind_param($stmt,"sssss",$first,$last,$email,$username,$hashedPwd);
mysqli_stmt_execute($stmt);
header("Location:../register.php?signup=success");
exit();
}
}
}
mysqli_stmt_close($stmt);
mysqli_close($conn);
}
}
else{
header("Location: ../signup.php");
exit();
}
?>
来源：https://stackoverflow.com/questions/60683422/so-i-am-trying-to-create-an-login-system-on-my-localhost-server-with-xampp-and-b