Inserting Data in Table with mySQLi - php

Question

I am trying to INSERT data into a table from a form using MySQLi. I have my database connection on a separate include file before including the form that will INSERT the data. my connection looks like so:
#$DB = new mysqli($mysqlHost,$mysqlUser,$mysqlPass,$mysqlDB);
if($DB ->connect_errno >0){
echo 'Could not connect to the server at this time. Please try again later.';
exit;
}
Now i want to execute a query that will store the users information into a table called users. When i run the query in phpMyAdmin it works fine, so i'm guessing its something to do with the syntax or my logic. Here is my insert code:
if($stmt = $DB->prepare("INSERT INTO `users`(`email`, `password`) VALUES ('value1', 'value2')")){
$stmt->execute();
$stmt->close();
}
echo 'Data INSERTED INTO table.';
Here is the error i am receiving:
Warning: mysqli::prepare(): Couldn't fetch mysqli in C:\xampp\htdocs\Phpclass\Website\includes\register.php
If you need additional information please let me know, i have been working on this for sometime now and it is very frustrated.

Answer 1

Change
$stmt = $DB->prepare("INSERT INTO `users`(`email`, `password`) VALUES ('value1', 'value2')");
To
if ($stmt = $DB->prepare("INSERT INTO `users`(`email`, `password`) VALUES (?, ?)"))
{
$stmt->bind_param("ss", 'value1', 'value2');
$stmt->execute();
$stmt->close();
}
You have you bind the parameters if you use prepared statements. Prepared statements can be used to re-use an SQL query repetitively, to import large chunks of data.
If you're not requiring to import large chunks of data I would recommend using the following instead:
$q = $DB->query("INSERT INTO `users`(`email`, `password`) VALUES ('value1', 'value2')");

Answer 2

You need to remove # before $DB, also check error like below ;
$DB = #new mysqli($mysqlHost,$mysqlUser,$mysqlPass,$mysqlDB);
if($DB->connect_errno){
echo 'Could not connect to the server at this time. Please try again later.';
exit;
}
$stmt = $DB->prepare("INSERT INTO `users`(`email`, `password`) VALUES ('value1', 'value2')")
if ($stmt === FALSE) {
die($DB->error);
}
$stmt->execute();
$stmt->close();
$DB->close();
echo 'Data INSERTED INTO table.';