how t o display image from url use pligg cms2.0

how t o display image from url use pligg cms2.0

the modifier $string =
preg_replace('/(http://|https://){1}.+?.(jpg|gif|bmp|bnp|png)$/is','<img
src="$0" alt="" />',$string);
return $string;
How can I write in the link_summary.tpl
thanks