I would use SplFileObject
. It is very fast and supports a nice linebased seek-feature :
public function loadCSV() {
$file = new SplFileObject($this->path);
$dbcnt = $this->getdbrows();
$file->seek($dbcnt); // <---- here
while (!$file->eof()) {
$record = $file->fgetcsv();
if ($record[$this->group] == '610') {
.. and so on..