WorksheetIterator.php

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

    private $_position = 0;

    public function __construct(PHPExcel $subject = null)
    {
        // Set subject
        $this->_subject = $subject;
    }

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

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

    public function current()
    {
        return $this->_subject->getSheet($this->_position);
    }

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

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

    public function valid()
    {
        return $this->_position < $this->_subject->getSheetCount();
    }
}