What is the best practice for handling form submissions in PHP to ensure data integrity and security?

To ensure data integrity and security when handling form submissions in PHP, it is best practice to sanitize and validate user input before processing it. This can help prevent SQL injection attacks, cross-site scripting (XSS) attacks, and other security vulnerabilities. One way to achieve this is by using PHP's filter_input function to sanitize user input and validate it against specific criteria. 

// Sanitize and validate form input
$name = filter_input(INPUT_POST, 'name', FILTER_SANITIZE_STRING);
$email = filter_input(INPUT_POST, 'email', FILTER_VALIDATE_EMAIL);

// Check if required fields are not empty
if(empty($name) || empty($email)) {
    // Handle error
    echo "Please fill out all required fields.";
} else {
    // Process form submission
    // Your code to handle form submission goes here
}

Keywords

SQL injection form validation prepared statements CSRF protection input sanitization

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