What security measures should be taken when handling form data in PHP, especially when dealing with multiple inputs of the same name?

When handling form data in PHP, especially when dealing with multiple inputs of the same name, it is important to sanitize and validate the input to prevent security vulnerabilities such as SQL injection or cross-site scripting attacks. One way to handle this is to use PHP's filter_input_array function to retrieve and filter the input data. This function allows you to specify the type of filtering and validation rules for each input field.

// Sanitize and validate form data
$input_data = filter_input_array(INPUT_POST, [
    'input_name' => FILTER_SANITIZE_STRING,
    'input_name2' => FILTER_SANITIZE_STRING,
    // Add more input fields as needed
]);

// Access sanitized input data
$input_name = $input_data['input_name'];
$input_name2 = $input_data['input_name2'];