What are best practices for handling data validation before inserting into a database in PHP?

When inserting data into a database in PHP, it is important to validate the data to prevent SQL injection attacks and ensure data integrity. One common approach is to use prepared statements with parameterized queries to sanitize input and prevent malicious code from being executed. Additionally, you can use PHP functions like filter_var() to validate input data against specific criteria such as email addresses, URLs, or integers. 

// Example of using prepared statements to insert data into a database in PHP

// 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 statement
$stmt->execute();

Keywords

data validation database insertion PHP sanitization prepared statements

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