Database connection

System connection(4database) :
This is what neither many coachings teach you nor any website correctly.

This code is mainly for connecting front
End page to backend (database).

<?php
$cn= mysql_connect ("localhost"," root","")
or die("could not connect ");

Where localhost is server name, root is username, "" is for password.

Session unset function

session_unset();
This function, as name implies ,unsets the current session .

session destroy

session_destroy ();
This function destroys the current session.

php session

A session is a way to store information to be used across multiple pages.
NOTE: ALWAYS WRITE THIS CODE ON THE TOP, EVEN BEFORE HTML SYNTAX.

<?php
session_start();
?>

php include function

php include function :

This function saves us from writing same  lines  of codes again & again in
different pages. This is very useful in the case of database connection code.

Syntax : include 'filename'
e.g.  <?php
         include("database. php")
         ?>
where database is filename & .php is its extension.

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