What are some potential pitfalls to avoid when using PHP as a scripting language?

One potential pitfall to avoid when using PHP as a scripting language is not properly sanitizing user input, which can lead to security vulnerabilities such as SQL injection attacks. To prevent this, always use prepared statements or parameterized queries when interacting with a database to prevent malicious input from being executed as SQL commands. 

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

Another pitfall to avoid is not validating and sanitizing input data from forms or user inputs, which can lead to cross-site scripting (XSS) attacks. Always validate and sanitize user input to prevent malicious scripts from being executed on your website.

```php
// Example of validating and sanitizing input data
$username = $_POST['username'];
$username = htmlspecialchars($username);
$username = filter_var($username, FILTER_SANITIZE_STRING);

Keywords

SQL injection cross-site scripting insecure file uploads unvalidated user input error reporting.

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