How can outdated HTML elements like frames and entities be updated in PHP code to comply with modern web standards?

Outdated HTML elements like frames can be updated by using modern alternatives like iframes or CSS for layout. Entities can be replaced with their respective Unicode characters. Here is an example of updating frames to iframes in PHP: 

<!DOCTYPE html>
<html>
<head>
    <title>Updated Frames</title>
</head>
<body>
    <iframe src="https://www.example.com"></iframe>
</body>
</html>

Keywords

HTML elements frames entities modern web standards PHP code.

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