mysqli prepared issue Number of variables doesn't match - php

Question

I am receiving error 'Number of variables doesn't match number of parameters in prepared statement'
$stmt = $this->conn->prepare( "INSERT INTO user
(
st1, u1, e1, sa1,
h1, roles_id, name_titles_id, first_name,
last_name, phone, mobile, address_road,
address_area, address_region, post_code, city,
country_id, creation_date, activated_at, modified_date_time,
created_by, referred_by, gender, ad1, status
)
VALUES
(
?, ?, ?, ?,
?, ?, ?, ?,
?, ?, ?, ?,
?, ?, ?, ?,
?, ?, ?, ?,
?, ?, ?, ?, ?
)"
)
$stmt->bind_param('i',$st1);
$stmt->bind_param('s',$u1);
$stmt->bind_param('s',$e1);
$stmt->bind_param('s',$sa1);
$stmt->bind_param('s',$h1);
$stmt->bind_param('i',$roles_id);
$stmt->bind_param('i',$name_titles_id);
$stmt->bind_param('s',$first_name);
$stmt->bind_param('s',$last_name);
$stmt->bind_param('s',$phone);
$stmt->bind_param('s',$mobile);
$stmt->bind_param('s',$address_road);
$stmt->bind_param('s',$address_area);
$stmt->bind_param('s',$address_region);
$stmt->bind_param('s',$post_code);
$stmt->bind_param('s',$city);
$stmt->bind_param('i',$country_id);
$stmt->bind_param('s',$creation_date);
$stmt->bind_param('s',$activated_at);
$stmt->bind_param('s',$modified_date_time);
$stmt->bind_param('i',$created_by);
$stmt->bind_param('i',$referred_by);
$stmt->bind_param('s',$gender);
$stmt->bind_param('s',$ad1);
$stmt->bind_param('i',$status);
Edit:
Just make a small test and it confirms, we can't use multiple bind_param with mysqli.
Not work:
$stmt->bind_param('s',$a);
$stmt->bind_param('s',$b);
Work:
$stmt->bind_param('ss',$a, $b);
Hopefully it'll be useful for future searches.

Answer 1

Your problem is simple. You are trying to do the thing manually, while the number of data asks for the automated process. You have to make a program to create a query for you.
Suppose You have an array with data already. All you need is to define the list of fields to insert
$fields = "st1,u1,e1,sa1,h1,roles_id,name_titles_id,first_name,last_name,phone,";
$fields .= "mobile,address_road,address_area,address_region,post_code,city,";
$fields .= "country_id,creation_date,activated_at,modified_date_time,";
$fields .= "created_by,referred_by,gender,ad1,status" ;
$fields = explode(",",$fields);
and then use some programming. Luckily, it's already done:
include 'safemysql.class.php';
$db = new safeMysql();
$insert = $db->filterArray($_POST,$fields);
$db->query("INSERT INTO user SET ?u", $insert);
And yeah, you are using bind_param wrong way. Correct usage can be seen in the manual page.