What are some recommended resources or tutorials for beginners to learn how to implement a robust user comment system using PHP and databases?

To implement a robust user comment system using PHP and databases, beginners can start by learning about PHP, MySQL (or other database systems), and basic CRUD operations (Create, Read, Update, Delete). They can also explore concepts like user authentication, input validation, and security measures to prevent SQL injection and cross-site scripting attacks. 

<?php
// Connect to the database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "comments_db";

$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// Insert a new comment into the database
if(isset($_POST['submit'])) {
    $comment = $_POST['comment'];
    $user_id = $_SESSION['user_id']; // Assuming user is logged in and user_id is stored in session

    $sql = "INSERT INTO comments (user_id, comment) VALUES ('$user_id', '$comment')";

    if ($conn->query($sql) === TRUE) {
        echo "Comment added successfully";
    } else {
        echo "Error: " . $sql . "<br>" . $conn->error;
    }
}

// Display comments from the database
$sql = "SELECT * FROM comments";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "User: " . $row['user_id'] . "<br>";
        echo "Comment: " . $row['comment'] . "<br><br>";
    }
} else {
    echo "No comments yet";
}

$conn->close();
?>

Keywords

PHP MySQL user comment system tutorials databases

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