In what scenarios would using an external editor be more efficient than using PHP to replace text blocks within a document?

Using an external editor would be more efficient than using PHP to replace text blocks within a document when the changes are extensive and require complex formatting or layout adjustments. In such scenarios, it may be quicker and easier to make the changes directly in the document using a text editor like Sublime Text or Visual Studio Code.

// Example PHP code to replace text blocks within a document
$file = 'example.txt';
$content = file_get_contents($file);
$newContent = str_replace('old text', 'new text', $content);
file_put_contents($file, $newContent);