call to a member function bind_param() on a non-object mysqli - php

Question

I am getting this error when I submit the form.
call to a member function bind_param() on a non-object
I have checked the console as well. It shows all the values I enter in the form. The values are getting stored in json variable and passed to the php page.It is on the bind_param() function, it shows the error. The same code works for the remaining 2 pages of my project, but it is not working for this one. Please help
Here is the PHP code
<?php
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "kites";
// Create connection
$conn = mysqli_connect($servername, $username, $password, $dbname);
// Check connection
if (!$conn) {
die("Connection failed: " . mysqli_connect_error());
alert("Connection failed");
}
else
{
// Check for empty fields
if(
empty($_POST['username']) || empty($_POST['password']) || empty($_POST['firstname']) || empty($_POST['lastname']) || empty($_POST['age']) || empty($_POST['contact']) || empty($_POST['streetname']) || empty($_POST['buildingname']) || empty($_POST['landmark']) || empty($_POST['area']) || empty($_POST['pincode']) || empty($_POST['email']) || empty($_POST['univ']) || empty($_POST['qualification']) || empty($_POST['dialcode']) || empty($_POST['countrycode']) || empty($_POST['bloodgroup']) || empty($_POST['school'])
)
{
echo json_encode(array('status'=>false,'msg'=>'No arguments provided'));
}
else if(is_numeric($_POST['firstname']) && is_numeric($_POST['lastname']))
{
echo json_encode(array('status'=>false,'msg'=>'Name should not contain numbers. Please try again'));
}
else if(!filter_var($_POST['email'], FILTER_VALIDATE_EMAIL))
{
echo json_encode(array('status'=>false,'msg'=>'Check your email id and try again'));
}
else if(!is_numeric($_POST['age']))
{
echo json_encode(array('status'=>false,'msg'=>'Age should contain only numbers'));
}
else{
$username = $_POST['username'];
$password = $_POST['password'];
$firstname = $_POST['firstname'];
$lastname = $_POST['lastname'];
$age = $_POST['age'];
$bloodgroup = $_POST['bloodgroup'];
$contact = $_POST['contact'];
$streetname = $_POST['streetname'];
$buildingname = $_POST['buildingname'];
$landmark = $_POST['landmark'];
$area = $_POST['area'];
$pincode = $_POST['pincode'];
$email = $_POST['email'];
$univ = $_POST['univ'];
$school = $_POST['school'];
$qualification = $_POST['qualification'];
$dialcode = $_POST['dialcode'];
$countrycode = $_POST['countrycode'];
// $sql = "INSERT INTO join_form (name,email,contact,role,dialcode,countrycode) VALUES ('$name','$email','$contact','$role','$dialcode','$countrycode')";
$stmt = $conn->prepare("INSERT INTO register_form(username,password,firstname,lastname,age,bloodgroup,contact,streetname,buildingname,landmark,area,pincode,email,univ,school,qualification,dialcode,countrycode) VALUES(?, ?, ?, ?, ?, ?,?, ?, ?, ?, ?, ?,?, ?, ?, ?, ?, ?)");
$stmt->bind_param("ssssisssssssssssss",$username,$password,$firstname,$lastname,$age,$bloodgroup,$contact,$streetname,$buildingname,$landmark,$area,$pincode,$email,$univ,$school,$qualification,$dialcode,$countrycode);
$sql = $stmt->execute();
if ($sql) {
echo json_encode(array('status'=>true,'msg'=>"New record created successfully"));
// // Create the email and send the message
// $to = 'naitikgada1995#gmail.com'; // Add your email address inbetween the '' replacing yourname#yourdomain.com - This is where the form will send a message to.
// $email_subject = "Registration Successfull: $name";
// $email_body = "We have sent this mail to inform you that your registration is successfull\n\n"
// ."Here are the details:\n\n"
// ."Name: $name\n\nEmail: $email\n\nContact:$contact\n\nPassword: $password\n\n";
// $headers = "From: noreply#kiddo.com\n";
// $headers .= "Reply-To: $email";
// mail($to,$email_subject,$email_body,$headers);
// // $response['status'] = 'true';
}
else {
echo json_encode(array('status'=>false,'msg'=>'Enter different email id or contact number and try again'));
// return false;
// $response['feedback'] = 'false';
// $response['message'] = 'Sorry, something went wrong. Please try again. Try entering a different email id and contact number';
// echo "Error: " . $sql . "<br>" . mysqli_error($conn);
}
// header("Content-Type: application/json; charset=utf-8", true);
}
}
?>

Answer 1

see if there is any spelling mistake or any other error in this line in the query
$stmt = $conn->prepare("INSERT INTO register_form(username,password,firstname,lastname,age,bloodgroup,contact,streetname,buildingname,landmark,area,pincode,email,univ,school,qualification,dialcode,countrycode) VALUES(?, ?, ?, ?, ?, ?,?, ?, ?, ?, ?, ?,?, ?, ?, ?, ?, ?)");