/**
* Implement PHP __clone to create a deep clone, not just a shallow copy.
*/
public function __clone()
{
foreach ($this as $key => $val) {
if ($key == '_parent') {
continue;
}
if (is_object($val) || is_array($val)) {
if ($key == '_cellCollection') {
$newCollection = clone $this->_cellCollection;
$newCollection->copyCellCollection($this);
$this->_cellCollection = $newCollection;
} elseif ($key == '_drawingCollection') {
$newCollection = clone $this->_drawingCollection;
$this->_drawingCollection = $newCollection;
} elseif ($key == '_autoFilter' && $this->_autoFilter instanceof PHPExcel_Worksheet_AutoFilter) {
$newAutoFilter = clone $this->_autoFilter;
$this->_autoFilter = $newAutoFilter;
$this->_autoFilter->setParent($this);
} else {
$this->{$key} = unserialize(serialize($val));
}
}
}
}
