PHP5 CSV Iterator

<?php 
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
?>