How can external functions be integrated into PHP form processing for better functionality?

To integrate external functions into PHP form processing for better functionality, you can include the external function file at the beginning of your PHP script using the `require_once` or `include_once` function. This allows you to access the functions defined in the external file and use them within your form processing code. 

<?php
// Include the external function file
require_once 'external_functions.php';

// Process form data using external functions
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $name = sanitize_input($_POST["name"]);
    $email = sanitize_input($_POST["email"]);
    
    // Call external function to validate email
    if (validate_email($email)) {
        // Email is valid, proceed with form processing
        // Additional processing code here
    } else {
        // Email is invalid, display error message
        echo "Invalid email address";
    }
}
?>

Keywords

External functions PHP form processing integration functionality libraries

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