What are the potential pitfalls of not properly escaping strings in SQL queries in PHP?

When not properly escaping strings in SQL queries in PHP, it leaves the application vulnerable to SQL injection attacks where malicious users can manipulate the queries to access or modify the database. To prevent this, it is crucial to use prepared statements or parameterized queries to safely handle user input. 

// Example of using prepared statements to prevent SQL injection

// Establish a database connection
$pdo = new PDO('mysql:host=localhost;dbname=mydatabase', 'username', 'password');

// Prepare a SQL query 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 escaping strings security vulnerability mysqli_real_escape_string prepared statements

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