How do I display PHP code in HTML?

by

Just like any other piece of text:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head><title></title>
</head>
<body>

<?php

$code="<?php
echo "Hello, World!";
?>";

echo '<pre>' . htmlspecialchars($code) . '</pre>';

?>

</body>
</html>

Optionally, PHP has a builtin function to generate syntax highlight:

<?php

$code="<?php
echo "Hello, World!";
?>";

highlight_string($code);

?>

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