how to encode and decode value in php


<?php
$smth = 'http%3A%2F%2Fexample.com';
$smth = preg_replace("/%u([0-9a-f]{3,4})/i","&#x\\1;",urldecode($smth)); 
$smth = html_entity_decode($smth,null,'UTF-8');
echo $smth ;
?>
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