What are some common mistakes to avoid when working with arrays and database queries in PHP, as seen in the provided forum thread?

Issue: Common mistakes to avoid when working with arrays and database queries in PHP include not properly escaping input data to prevent SQL injection, not checking for errors after executing queries, and not sanitizing output data to prevent XSS attacks. Fix: To prevent SQL injection, always use prepared statements or parameterized queries when interacting with a database. To check for errors after executing queries, utilize error handling mechanisms such as try-catch blocks. Finally, sanitize output data using functions like htmlspecialchars() before displaying it to prevent XSS attacks. 

// Example of using prepared statements to prevent SQL injection
$stmt = $pdo->prepare("SELECT * FROM users WHERE username = ?");
$stmt->execute([$username]);

// Example of error handling after executing a query
if(!$stmt){
    die("Error executing query: " . $pdo->errorInfo());
}

// Example of sanitizing output data to prevent XSS attacks
echo htmlspecialchars($user['username']);

Keywords

arrays database queries PHP mistakes forum thread

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