问题
After answering Zend_Cache: After loading cached data, character encoding seems messed up
I use it to change the PHP's internal encoding , its originally ISO-8859-1,
so I need to change the encoding of every non English input value, but using it I force PHP to convert every value to UTF-8, as you might see in the question linked above.
I am Caching arabic text in files using Zend_cache, I wasn't be able to do it without that function.
I need to know: How bad is to use this function mb_internal_encoding("UTF-8");?
I had adopt to use this function in every project I opt in , all of them are using non-english characters
来源：https://stackoverflow.com/questions/4045060/how-bad-is-mb-internal-encodingutf-8