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<?php$s=str_repeat("xD", 100);function hash_part($start,$length) {        $ctx = hash_init('md5'); 	$ch = "";	$remaining=$length;	while ($remaining > 0) {		//$data = fread($fp, $chunkSize);		$data = $GLOBALS['s'];				$read = hash_update($ctx, $data);		$ch .= md5($data);				$remaining -= strlen($data);        }	return hash_final($ctx) . " : " . md5($ch);}for($i=0;$i<100;$i++)echo hash_part(0,40*1024*1024) . "\n";?>