- urlencode: documentation ( source)
<?php
$url = 'http://cdn.online-bouwmaterialen.nl/pdf/Orth Gipsblok Z70 450x500x70mm 1,25 Zwaar.pdf';
$url2 = 'http://cdn.online-bouwmaterialen.nl/pdf/Orth%20Gipsblok%20Z70%20450x500x70mm%201,25%20Zwaar.pdf';
echo $url2;
echo urlencode($url);