How can external PHP files be integrated into a form submission process and what considerations should be taken into account?

External PHP files can be integrated into a form submission process by including them in the form processing script using the `require` or `include` functions. It is important to ensure that the external PHP file contains the necessary code to handle form data validation, processing, and submission. Additionally, proper error handling and security measures should be implemented to protect against potential vulnerabilities. 

// Include external PHP file for form processing
require 'form_processing.php';

// Code to handle form submission
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Process form data
    // Validate input
    // Submit form data
}

Keywords

File inclusion Form submission Security PHP functions Error handling

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