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index.php :
"Hello World" is a string of characters.
A string of characters is text.
echo "Hello World" means prints the text onto the page.
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Demo</title>
</head>
<body>
<h1>
<?php
echo "Hello World"
?>
</h1>
</body>
</html>
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