mysql connection throughtout the session - php

Question

I have a problem. Successfully made a login.php page that uses function:
db_connect();
to connect to MySQL database. Now I'm creating another page that would edit previous entries, but I can't access it with simple
db_edit(){... $result = mysqli_query($conn, $insert_query); ...}
because it says either:
"Warning: mysqli_query(): Couldn't fetch mysqli" or " Warning: mysqli_query() expects parameter 1 to be mysqli, null given"
It looks like the connection breaks when jumping to another page, and it should be reestablished from beginning like:
db_connect(); //again?
db_edit();
What is the proper way to pass database connection parameters from one session page to another? Should I pass $conn or $user and $pass? How do I do it?

Answer 1

You must include page of database connection to every page. Here you used db_connect() at one page but in second you didn't use it so you can not access MYSQLI from second page
Let take simple sample
database.php
<?php
// Here place code for database connection for mysqli
$con = mysqli_connect("localhost","root","pass"); //Localhost
if (!$con) {
die('Could not connect: ' . mysqli_error());
}
mysqli_select_db("testdb", $con);
?>
Page1.php
<?php
include_once("database.php");
...
$result = mysqli_query($con, $insert_query);
...
?>
Page2.php
<?php
include_once("database.php");
...
$result = mysqli_query($con, $insert_query);
...
?>
If you have more pages then you use include_once("database.php"); on each page.
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