在不进行特殊设置的情况下，phpExcel将读取的单元格信息保存在内存中，我们可以通过
PHPExcel_Settings::setCacheStorageMethod()
来设置不同的缓存方式，已达到降低内存消耗的目的！
1、将单元格数据序列化后保存在内存中
PHPExcel_CachedObjectStorageFactory::cache_in_memory_serialized;
2、将单元格序列化后再进行Gzip压缩，然后保存在内存中
PHPExcel_CachedObjectStorageFactory::cache_in_memory_gzip;
3、缓存在临时的磁盘文件中，速度可能会慢一些
PHPExcel_CachedObjectStorageFactory::cache_to_discISAM;
4、保存在php://temp
PHPExcel_CachedObjectStorageFactory::cache_to_phpTemp;
5、保存在memcache中
PHPExcel_CachedObjectStorageFactory::cache_to_memcache
$cacheMethod = PHPExcel_CachedObjectStorageFactory::cache_to_memcache; $cacheSettings = array( 'memcacheServer' => 'localhost', 'memcachePort' => 11211, 'cacheTime' => 600 ); PHPExcel_Settings::setCacheStorageMethod($cacheMethod, $cacheSettings);
注意是加在new PHPExcel() 前面：如下
1 require_once APPPATH .'third_party/PHPExcel/PHPExcel.php'; 2 3 $cacheMethod = PHPExcel_CachedObjectStorageFactory::cache_to_phpTemp; 4 $cacheSettings = array('memoryCacheSize'=>'16MB'); 5 PHPExcel_Settings::setCacheStorageMethod($cacheMethod, $cacheSettings); 6 7 $objPHPExcel = new PHPExcel();
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