🟢 Step 1: Project Setup
mkdir composer-exam
cd composer-exam
composer init -yInstall packages:
composer require monolog/monolog
composer require guzzlehttp/guzzle
composer require phpmailer/phpmailer🟢 Step 2: Folder Structure
composer-exam/
│
├── composer.json
├── vendor/
├── index.php
├── logger.php
├── api.php
├── mail.php
├── src/
│ └── User.php
├── logs/
│ └── app.log
🟡 Step 3: Logger System (logger.php)
<?phprequire 'vendor/autoload.php';use Monolog\Logger;
use Monolog\Handler\StreamHandler;// Create log channel
$log = new Logger('app');// Create logs directory if not exists
if (!file_exists('logs')) {
mkdir('logs', 0777, true);
}// Add handler
$log->pushHandler(new StreamHandler('logs/app.log', Logger::DEBUG));// Logs
$log->info('User visited site');
$log->warning('Invalid login attempt');
$log->error('System failure');echo "Logs created successfully!";🟡 Step 4: API Integration (api.php)
<?phprequire 'vendor/autoload.php';use GuzzleHttp\Client;$client = new Client();try {
$response = $client->request('GET', 'https://jsonplaceholder.typicode.com/users'); $data = json_decode($response->getBody(), true); echo "<h3>First 3 Users:</h3>"; for ($i = 0; $i < 3; $i++) {
echo "Name: " . $data[$i]['name'] . "<br>";
echo "Email: " . $data[$i]['email'] . "<br><br>";
}} catch (Exception $e) {
echo "Error: " . $e->getMessage();
}🟠 Step 5: Email System (mail.php)
<?phprequire 'vendor/autoload.php';use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;$mail = new PHPMailer(true);try {
// SMTP Settings (example: Gmail)
$mail->isSMTP();
$mail->Host = 'smtp.gmail.com';
$mail->SMTPAuth = true;
$mail->Username = 'your_email@gmail.com';
$mail->Password = 'your_app_password'; // Use App Password
$mail->SMTPSecure = 'tls';
$mail->Port = 587; // Email settings
$mail->setFrom('your_email@gmail.com', 'Test');
$mail->addAddress('test@example.com'); $mail->Subject = 'Test Mail';
$mail->Body = 'Hello from Composer'; $mail->send();
echo "Email sent successfully!";} catch (Exception $e) {
echo "Mailer Error: {$mail->ErrorInfo}";
}🔴 Step 6: PSR-4 Autoloading
Update composer.json
{
"require": {
"monolog/monolog": "^3.0",
"guzzlehttp/guzzle": "^7.0",
"phpmailer/phpmailer": "^6.0"
},
"autoload": {
"psr-4": {
"App\\": "src/"
}
}
}Run:
composer dump-autoloadCreate Class: src/User.php
<?php namespace App;class User {
public function getName() {
return "Aditya";
}
}Use in index.php
<?php require 'vendor/autoload.php';use App\User;$user = new User();echo $user->getName();🔴 Step 7: Mini Project (Contact Form)
👉 form.html
<!DOCTYPE html>
<html>
<head>
<title>Contact Form</title>
</head>
<body><form method="POST" action="contact.php">
Name: <input type="text" name="name" required><br><br>
Email: <input type="email" name="email" required><br><br>
Message: <textarea name="message" required></textarea><br><br>
<button type="submit">Send</button>
</form></body>
</html>👉 contact.php
<?php require 'vendor/autoload.php';use Monolog\Logger;
use Monolog\Handler\StreamHandler;
use PHPMailer\PHPMailer\PHPMailer;// Get form data
$name = $_POST['name'];
$email = $_POST['email'];
$message = $_POST['message'];// Validate
if (empty($name) || empty($email) || empty($message)) {
die("All fields are required!");
}// Logger
$log = new Logger('contact');
$log->pushHandler(new StreamHandler('logs/app.log', Logger::INFO));
$log->info("Contact form submitted by: $email");// Send Email
$mail = new PHPMailer(true);try {
$mail->isSMTP();
$mail->Host = 'smtp.gmail.com';
$mail->SMTPAuth = true;
$mail->Username = 'your_email@gmail.com';
$mail->Password = 'your_app_password';
$mail->SMTPSecure = 'tls';
$mail->Port = 587; $mail->setFrom($email, $name);
$mail->addAddress('your_email@gmail.com'); $mail->Subject = 'New Contact Message';
$mail->Body = "Name: $name\nEmail: $email\nMessage: $message"; $mail->send(); echo "Message sent successfully!";} catch (Exception $e) {
echo "Error: {$mail->ErrorInfo}";
}🧠 Step 8: Restore Project (Important)
👉 If vendor/ deleted:
composer install✅ Final Output Checklist
✔ Logs created
✔ API data fetched
✔ Email working
✔ Autoload working
✔ Contact form working
🚀 Pro Tips (Real Industry)
- Use
.envfor email credentials - Never hardcode passwords
- Always validate user input
- Use MVC structure for large apps
