PHP process model per request - Mini Project: Build & Apply

Understanding PHP Process Model Per Request

📖 Scenario: You are learning how PHP handles web requests. Each time a user visits a PHP page, the server creates a new process to run your PHP code from the start. This means variables and data do not stay between requests unless saved outside the script.

🎯 Goal: Build a simple PHP script that shows how variables reset on each request by counting visits using a session.

📋 What You'll Learn

Create a PHP script with a variable to count visits

Use a session variable to store the visit count

Increment the visit count on each request

Display the current visit count

💡 Why This Matters

🌍 Real World

Websites use PHP sessions to remember users and keep data like login status or shopping carts between page visits.

💼 Career

Understanding PHP's process model and sessions is essential for backend web developers working with PHP to build dynamic, user-friendly websites.

1

Create a PHP script with a visit count variable

Create a PHP file and write code to start a session with session_start(). Then create a variable called visitCount and set it to 0.

PHP

<?php
session_start();
// Your code here

Need a hint?

Use session_start() at the top to enable sessions. Then create $visitCount and set it to 0.

2

Add session variable to store visit count

Add code to check if $_SESSION['visitCount'] exists. If it does, set $visitCount to $_SESSION['visitCount']. Otherwise, keep $visitCount as 0.

PHP

<?php
session_start();
$visitCount = 0;
// Your code here

Need a hint?

Use isset() to check if the session variable exists before using it.

3

Increment the visit count and save it in session

Increase $visitCount by 1. Then save the new value back to $_SESSION['visitCount'].

PHP

<?php
session_start();
$visitCount = 0;
if (isset($_SESSION['visitCount'])) {
    $visitCount = $_SESSION['visitCount'];
}
// Your code here

Need a hint?

Use $visitCount++ to add one, then store it in the session.

4

Display the current visit count

Write a print statement to show the text: "You have visited this page X times." where X is the value of $visitCount.

PHP

<?php
session_start();
$visitCount = 0;
if (isset($_SESSION['visitCount'])) {
    $visitCount = $_SESSION['visitCount'];
}
$visitCount++;
$_SESSION['visitCount'] = $visitCount;
// Your code here

Need a hint?

Use print() with double quotes and include $visitCount inside the string.