What are the potential risks of not properly escaping user input before querying a database in PHP?

Not properly escaping user input before querying a database in PHP can lead to SQL injection attacks, where malicious users can manipulate the query to access, modify, or delete data. To prevent this, always use prepared statements or parameterized queries to properly escape user input before executing any database queries. 

// Connect to the database
$pdo = new PDO('mysql:host=localhost;dbname=mydatabase', 'username', 'password');

// Prepare a SQL statement with a placeholder for user input
$stmt = $pdo->prepare('SELECT * FROM users WHERE username = :username');

// Bind the user input to the placeholder
$stmt->bindParam(':username', $_POST['username']);

// Execute the query
$stmt->execute();

// Fetch the results
$results = $stmt->fetchAll();

Keywords

SQL injection security vulnerability htmlspecialchars prepared statements escaping user input

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