<div class="input">
<input type="text" readonly id="input-url" value="<?php  $Path=$_SERVER['REQUEST_URI']; $siteurl= site_url(); echo $URI= $siteurl.$Path;  ?>"> 
<button type="button" onclick="copy('input-url')">Kopyala</button>

function copy(id) { 
document.getElementById(id).select(); 
document.execCommand('copy'); 
notification('Successfully copied.'); }