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();
phpExcel大数据量情况下内存溢出解决
原文地址：http://www.cnblogs.com/hopelooking/p/7686321.html