MemoryGZip.php

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<?php
class PHPExcel_CachedObjectStorage_MemoryGZip extends PHPExcel_CachedObjectStorage_CacheBase implements PHPExcel_CachedObjectStorage_ICache {

        protected function _storeData() {
                if ($this->_currentCellIsDirty && !empty($this->_currentObjectID)) {
                        $this->_currentObject->detach();

                        $this->_cellCache[$this->_currentObjectID] = gzdeflate(serialize($this->_currentObject));
                        $this->_currentCellIsDirty = false;
                }
                $this->_currentObjectID = $this->_currentObject = null;
        }       //      function _storeData()


        public function addCacheData($pCoord, PHPExcel_Cell $cell) {
                if (($pCoord !== $this->_currentObjectID) && ($this->_currentObjectID !== null)) {
                        $this->_storeData();
                }

                $this->_currentObjectID = $pCoord;
                $this->_currentObject = $cell;
                $this->_currentCellIsDirty = true;

                return $cell;
        }       //      function addCacheData()


        public function getCacheData($pCoord) {
                if ($pCoord === $this->_currentObjectID) {
                        return $this->_currentObject;
                }
                $this->_storeData();

                //      Check if the entry that has been requested actually exists
                if (!isset($this->_cellCache[$pCoord])) {
                        //      Return null if requested entry doesn't exist in cache
                        return null;
                }

                //      Set current entry to the requested entry
                $this->_currentObjectID = $pCoord;
                $this->_currentObject = unserialize(gzinflate($this->_cellCache[$pCoord]));
        //    Re-attach this as the cell's parent
        $this->_currentObject->attach($this);

                //      Return requested entry
                return $this->_currentObject;
        }       //      function getCacheData()


        public function getCellList() {
                if ($this->_currentObjectID !== null) {
                        $this->_storeData();
                }

                return parent::getCellList();
        }


        public function unsetWorksheetCells() {
                if(!is_null($this->_currentObject)) {
                        $this->_currentObject->detach();
                        $this->_currentObject = $this->_currentObjectID = null;
                }
                $this->_cellCache = array();

                //      detach ourself from the worksheet, so that it can then delete this object successfully
                $this->_parent = null;
        }       //      function unsetWorksheetCells()

}