พี่ๆช่วยแก้สคิปดูดรูปหน่อย Warning: fwrite(): supplied argument is not a valid stream resource in

$fs = fopen($file,'wb');

$fp = fopen($file,'wb');

<?php
set_time_limit (0);
for($i=1; $i<=3; $i++) {

	$num = sprintf("%03d", $i);
	$file = "$num.jpg";
	print "Download -> $file\n";

	$wp = fopen("http://localhost/d/$file", 'r');
	$fp = fopen($file,'wb');
	do {
		$r = fread($wp, 128);
		fwrite( $fp, $r);
	} while( !feof($wp));
	fclose($fp);
}

?>