gistfile1.txt

function img_process( $src , $size ) {
	$pathinfo = pathinfo($src);
	$pathname = $pathinfo['dirname'];
	$filename = $pathinfo['basename'];
	if($src){
		if($size == 'xs'){
				echo $pathname.'/4_'.$filename;
		} elseif ($size == 'sm') {
				echo $pathname.'/3_'.$filename;
		} elseif ($size == 'md') {
				echo $pathname.'/2_'.$filename;
		} else {
				echo $pathname.'/'.$filename;
		}
	} else {

		if($size == 'xs'){
				echo 'http://placehold.it/142x87';
		} elseif ($size == 'sm') {
				echo 'http://placehold.it/220x135';
		} elseif ($size == 'md') {
				echo 'http://placehold.it/204x156';
		} else {
				echo 'http://placehold.it/370x216';
		}
	
	}
}