When are Frames considered a suitable option for web development in PHP?

Frames are considered a suitable option for web development in PHP when you need to display multiple independent HTML documents within a single web page. This can be useful for creating layouts with fixed headers or sidebars that remain static while the main content changes. However, frames should be used sparingly as they can cause accessibility issues and may not be supported in modern web development practices.

<!DOCTYPE html>
<html>
<head>
    <title>Using Frames in PHP</title>
</head>
<frameset cols="20%,80%">
    <frame src="sidebar.php" name="sidebar">
    <frame src="main_content.php" name="main_content">
</frameset>
</html>