How can one prevent unintentional deletion of content when editing specific text sections in PHP files using a textarea input?

To prevent unintentional deletion of content when editing specific text sections in PHP files using a textarea input, one can implement a solution by storing the original content in a hidden input field and then merging it with the edited content upon submission. This way, the original content is preserved and can be updated as needed without the risk of accidental deletion.

<?php
// Retrieve the original content from a hidden input field
$original_content = $_POST['original_content'];

// Merge the original content with the edited content from the textarea input
$edited_content = $original_content . "\n" . $_POST['edited_content'];

// Save the merged content back to the PHP file or database
// For example, file_put_contents('file.php', $edited_content);
?>