PHPTemp.php

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<?php
class PHPExcel_CachedObjectStorage_PHPTemp extends PHPExcel_CachedObjectStorage_CacheBase implements PHPExcel_CachedObjectStorage_ICache {

        private $_fileHandle = null;


        private $_memoryCacheSize = null;

        private function _storeData() {
                $this->_currentObject->detach();

                fseek($this->_fileHandle,0,SEEK_END);
                $offset = ftell($this->_fileHandle);
                fwrite($this->_fileHandle, serialize($this->_currentObject));
                $this->_cellCache[$this->_currentObjectID]      = array('ptr' => $offset,
                                                                                                                        'sz'  => ftell($this->_fileHandle) - $offset
                                                                                                                   );
                $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;

                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 = $pCoord;
                fseek($this->_fileHandle,$this->_cellCache[$pCoord]['ptr']);
                $this->_currentObject = unserialize(fread($this->_fileHandle,$this->_cellCache[$pCoord]['sz']));
                //      Re-attach the parent worksheet
                $this->_currentObject->attach($this->_parent);

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


        public function copyCellCollection(PHPExcel_Worksheet $parent) {
                parent::copyCellCollection($parent);
                //      Open a new stream for the cell cache data
                $newFileHandle = fopen('php://temp/maxmemory:'.$this->_memoryCacheSize,'a+');
                //      Copy the existing cell cache data to the new stream
                fseek($this->_fileHandle,0);
                while (!feof($this->_fileHandle)) {
                        fwrite($newFileHandle,fread($this->_fileHandle, 1024));
                }
                $this->_fileHandle = $newFileHandle;
        }       //      function copyCellCollection()


        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;

                //      Close down the php://temp file
                $this->__destruct();
        }       //      function unsetWorksheetCells()


        public function __construct(PHPExcel_Worksheet $parent, $memoryCacheSize = '1MB') {
                $this->_memoryCacheSize = (isset($arguments['memoryCacheSize']))        ? $arguments['memoryCacheSize'] : '1MB';

                parent::__construct($parent);
                if (is_null($this->_fileHandle)) {
                        $this->_fileHandle = fopen('php://temp/maxmemory:'.$this->_memoryCacheSize,'a+');
                }
        }       //      function __construct()


        public function __destruct() {
                if (!is_null($this->_fileHandle)) {
                        fclose($this->_fileHandle);
                }
                $this->_fileHandle = null;
        }       //      function __destruct()

}