What are potential pitfalls when creating a chat in PHP for a beginner?

One potential pitfall when creating a chat in PHP for a beginner is not properly sanitizing user input, which can lead to security vulnerabilities such as SQL injection or cross-site scripting attacks. To solve this issue, always use prepared statements when interacting with a database and sanitize user input to prevent malicious code execution. 

// Example of using prepared statements to prevent SQL injection
$stmt = $pdo->prepare('SELECT * FROM users WHERE username = :username');
$stmt->bindParam(':username', $_POST['username']);
$stmt->execute();
```

```php
// Example of sanitizing user input to prevent cross-site scripting attacks
$username = htmlspecialchars($_POST['username']);
$message = htmlspecialchars($_POST['message']);

Keywords

MySQL AJAX security vulnerabilities real-time messaging PHP frameworks

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