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<!DOCTYPE html>
<html>
<body>
<?php
// Variable to check
$url="https://www.w3schoolsÅÅ.com";
// Encode characters
$url = filter_var($url, FILTER_SANITIZE_ENCODED);
echo $url;
?> 
</body>
</html>
https%3A%2F%2Fwww.w3schools%C3%85%C3%85.com