How can PHP form input validation be improved to avoid SQL errors when inserting data into a database?

When inserting user input into a database using PHP, it is crucial to validate the input to prevent SQL injection attacks. One way to improve PHP form input validation is to use prepared statements with parameterized queries. This method separates SQL code from user input, making it impossible for malicious SQL code to be injected. 

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

// Prepare a SQL statement with placeholders
$stmt = $pdo->prepare("INSERT INTO users (username, email) VALUES (:username, :email)");

// Bind parameters to the placeholders
$stmt->bindParam(':username', $_POST['username']);
$stmt->bindParam(':email', $_POST['email']);

// Execute the prepared statement
$stmt->execute();

Keywords

PHP form input validation SQL errors database insertion data security

Related Questions