Git is a distributed version control system DVCS designed for efficient source code management, suitable for both small and large projects. It allows multiple developers to work on a project simultaneously without overwriting changes, supporting collaborative work, continuous integration, and deployment. This Git and GitHub tutorial is designed for beginners to learn fundamentals and advanced concepts, including branching, pushing, merging conflicts, and essential Git commands. Prerequisites include familiarity with the command line interface CLI, a text editor, and basic programming concepts. Git was developed by Linus Torvalds for Linux kernel development and tracks changes, manages versions, and enables collaboration among developers. It provides a complete backup of project history in a repository. GitHub is a hosting service for Git repositories, facilitating project access, collaboration, and version control. The tutorial covers topics such as Git installation, repository creation, Git Bash usage, managing branches, resolving conflicts, and working with platforms like Bitbucket and GitHub. The text is a comprehensive guide to using Git and GitHub, covering a wide range of topics. It includes instructions on working directories, using submodules, writing good commit messages, deleting local repositories, and understanding Git workflows like Git Flow versus GitHub Flow. There are sections on packfiles, garbage collection, and the differences between concepts like HEAD, working tree, and index. Installation instructions for Git across various platforms Ubuntu, macOS, Windows, Raspberry Pi, Termux, etc. are provided, along with credential setup. The guide explains essential Git commands, their usage, and advanced topics like debugging, merging, rebasing, patch operations, hooks, subtree, filtering commit history, and handling merge conflicts. It also covers managing branches, syncing forks, searching errors, and differences between various Git operations e.g., push origin vs. push origin master, merging vs. rebasing. The text provides a comprehensive guide on using Git and GitHub. It covers creating repositories, adding code of conduct, forking and cloning projects, and adding various media files to a repository. The text explains how to push projects, handle authentication issues, solve common Git problems, and manage repositories. It discusses using different IDEs like VSCode, Android Studio, and PyCharm, for Git operations, including creating branches and pull requests. Additionally, it details deploying applications to platforms like Heroku and Firebase, publishing static websites on GitHub Pages, and collaborating on GitHub. Other topics include the use of Git with R and Eclipse, configuring OAuth apps, generating personal access tokens, and setting up GitLab repositories. The text covers various topics related to Git, GitHub, and other version control systems Key Pointers Git is a distributed version control system DVCS for source code management. Supports collaboration, continuous integration, and deployment. Suitable for both small and large projects. Developed by Linus Torvalds for Linux kernel development. Tracks changes, manages versions, and provides complete project history. GitHub is a hosting service for Git repositories. Tutorial covers Git and GitHub fundamentals and advanced concepts. Includes instructions on installation, repository creation, and Git Bash usage. Explains managing branches, resolving conflicts, and using platforms like Bitbucket and GitHub. Covers working directories, submodules, commit messages, and Git workflows. Details packfiles, garbage collection, and Git concepts HEAD, working tree, index. Provides Git installation instructions for various platforms. Explains essential Git commands and advanced topics debugging, merging, rebasing. Covers branch management, syncing forks, and differences between Git operations. Discusses using different IDEs for Git operations and deploying applications. Details using Git with R, Eclipse, and setting up GitLab repositories. Explains CI/CD processes and using GitHub Actions. Covers internal workings of Git and its decentralized model. Highlights differences between Git version control system and GitHub hosting platform.
Hello there, in this tutorial we will learn how to send real-time notifications to a user when someone follows them, you can use a combination of PHP and MySQL along with a WebSocket connection. Here are the steps:
1. Create a database table to store the followers information. The table should have at least three columns: id, follower_id, and user_id. The id column should be an auto-increment primary key, follower_id column should store the id of the user who is following, and user_id column should store the id of the user who is being followed.
2. Create a PHP script that inserts a new row into the followers table whenever a user follows another user. This script should take the follower_id and user_id as parameters and insert them into the followers table.
3. Create a WebSocket server that listens for new follower events. Whenever a new follower event occurs, the server should broadcast a notification to the user who is being followed. You can use a library like Ratchet to create a WebSocket server in PHP.
4. Modify the PHP script that inserts a new row into the followers table to also send a new follower event to the WebSocket server. This can be done using a library like Guzzle to make an HTTP request to the WebSocket server.
5. Create a JavaScript client that listens for new follower notifications and displays them to the user. This can be done using a library like Socket.IO to create a WebSocket connection between the client and the server.
Here's an example PHP code that inserts a new follower into the database and sends a notification to the WebSocket server:
<?php
// Connect to the database
$db = new mysqli('localhost', 'username', 'password', 'database');
// Get the follower_id and user_id from the POST request
$follower_id = $_POST['follower_id'];
$user_id = $_POST['user_id'];
// Insert a new row into the followers table
$stmt = $db->prepare("INSERT INTO followers (follower_id, user_id) VALUES (?, ?)");
$stmt->bind_param('ii', $follower_id, $user_id);
$stmt->execute();
// Send a notification to the WebSocket server
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'http://localhost:8000/new-follower');
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode([
'user_id' => $user_id,
]));
curl_exec($ch);
curl_close($ch);
?>
And here's an example WebSocket server code that broadcasts a new follower notification to all connected clients:
<?php
use Ratchet\MessageComponentInterface;
use Ratchet\ConnectionInterface;
class FollowerServer implements MessageComponentInterface {
protected $clients;
public function __construct() {
$this->clients = new \SplObjectStorage;
}
public function onOpen(ConnectionInterface $conn) {
$this->clients->attach($conn);
}
public function onClose(ConnectionInterface $conn) {
$this->clients->detach($conn);
}
public function onMessage(ConnectionInterface $from, $msg) {
foreach ($this->clients as $client) {
if ($client !== $from) {
$client->send($msg);
}
}
}
public function onError(ConnectionInterface $conn, \Exception $e) {
$conn->close();
}
}
$server = new \Ratchet\App('localhost', 8000);
$server->route('/new-follower', new class implements MessageComponentInterface {
protected $clients;
public function __construct() {
$this->clients = new \SplObjectStorage;
}
public function onOpen(ConnectionInterface $conn) {
$this->clients->attach($conn);
}
