How can one avoid potentially disastrous commands in PHP programming?

To avoid potentially disastrous commands in PHP programming, always validate and sanitize user input to prevent SQL injection, cross-site scripting (XSS), and other security vulnerabilities. Additionally, use prepared statements when interacting with databases to prevent SQL injection attacks. 

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

Keywords

SQL injection cross-site scripting input validation escapeshellarg secure coding practices

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