What are some best practices for securely handling and processing form data in PHP?

When handling form data in PHP, it is important to sanitize and validate the input to prevent security vulnerabilities such as SQL injection and cross-site scripting attacks. One way to achieve this is by using PHP's filter_input() function to sanitize user input and validate it against a specific filter type. 

// Sanitize and validate form data using filter_input()
$username = filter_input(INPUT_POST, 'username', FILTER_SANITIZE_STRING);
$email = filter_input(INPUT_POST, 'email', FILTER_VALIDATE_EMAIL);
$password = filter_input(INPUT_POST, 'password', FILTER_SANITIZE_STRING);

// Perform further validation or processing as needed

Keywords

SQL injection Cross-site scripting Data validation Prepared statements CSRF protection

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