php method to traverse CSV php class to traverse csv

/**
* Traverse csv files
* edit: bbs.it-home.org
*/
class CSVIterator implements Iterator
{
    const ROW_SIZE = 4096;

    private $filePointer;
    private $currentElement;
    private $rowCounter;
    private $delimiter;

    public function __construct( $file, $delimiter = ',' )
    {
        $this->filePointer = fopen( $file, 'r' );
        $this->delimiter   = $delimiter;
    }

    public function rewind()
    {
        $this->rowCounter = 0;
        rewind( $this->filePointer );
    }

    public function current()
    {
        $this->currentElement = fgetcsv( $this->filePointer, self::ROW_SIZE, $this->delimiter );
        $this->rowCounter++;
        return $this->currentElement;
    }

    public function key()
    {
        return $this->rowCounter;
    }

    public function next()
    {
        return !feof( $this->filePointer );
    }

    public function valid()
    {
        if( !$this->next() )
        {
            fclose( $this->filePointer );
            return FALSE;
        }
        return TRUE;
    }

} // end class
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