RowIterator.php

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<?php
class PHPExcel_Worksheet_RowIterator implements Iterator
{
        private $_subject;

        private $_position = 1;

        private $_startRow = 1;


        private $_endRow = 1;


        public function __construct(PHPExcel_Worksheet $subject = null, $startRow = 1, $endRow = null) {
                // Set subject
                $this->_subject = $subject;
                $this->resetEnd($endRow);
                $this->resetStart($startRow);
        }

        public function __destruct() {
                unset($this->_subject);
        }

        public function resetStart($startRow = 1) {
                $this->_startRow = $startRow;
                $this->seek($startRow);

        return $this;
        }

        public function resetEnd($endRow = null) {
                $this->_endRow = ($endRow) ? $endRow : $this->_subject->getHighestRow();

        return $this;
        }

        public function seek($row = 1) {
        if (($row < $this->_startRow) || ($row > $this->_endRow)) {
            throw new PHPExcel_Exception("Row $row is out of range ({$this->_startRow} - {$this->_endRow})");
        }
                $this->_position = $row;

        return $this;
        }

        public function rewind() {
                $this->_position = $this->_startRow;
        }

        public function current() {
                return new PHPExcel_Worksheet_Row($this->_subject, $this->_position);
        }

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

        public function next() {
                ++$this->_position;
        }

        public function prev() {
        if ($this->_position <= $this->_startRow) {
            throw new PHPExcel_Exception("Row is already at the beginning of range ({$this->_startRow} - {$this->_endRow})");
        }

        --$this->_position;
        }

        public function valid() {
                return $this->_position <= $this->_endRow;
        }
}