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How can setting the correct HTTP header content type and meta charset tags help prevent Umlaut display issues in PHP web applications?

Setting the correct HTTP header content type and meta charset tags in PHP web applications can help prevent Umlaut display issues by ensuring that the correct character encoding is specified. This helps the browser interpret and display special characters, such as Umlauts, correctly.

php 
<?php
header('Content-Type: text/html; charset=utf-8');
echo '<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
</head>
<body>
<p>Umlauts: ä, ö, ü</p>
</body>
</html>';
?>

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