What is the recommended method for passing values from one PHP file to another when clicking a button?

When clicking a button in PHP, the recommended method for passing values from one PHP file to another is to use form submission with either POST or GET methods. By submitting a form, you can send data from one PHP file to another, where you can access the values using $_POST or $_GET superglobals. This allows you to transfer information securely between PHP files without exposing sensitive data in the URL.

// Form submission in the first PHP file
<form action="second_php_file.php" method="post">
    <input type="hidden" name="value_to_pass" value="example_value">
    <button type="submit">Submit</button>
</form>
```

```php
// Retrieving the passed value in the second PHP file
<?php
if(isset($_POST['value_to_pass'])) {
    $passed_value = $_POST['value_to_pass'];
    echo "The passed value is: " . $passed_value;
}
?>