Sina sae development cannot write files

Today, I was developing on Sina sae and found that the file could not be written, prompting a permission problem.

The code is as follows:

The error is as follows:

After checking the writing information, I found that I cannot have permission to write files in Sina sae development, so how to solve this problem? Finally, I found that Storage can be used for read and write operations.

added the prefix saestor://, and indeed, no error was reported. The modified code is as follows:

Finally, I found that if you use Memcache, or file Caching requires a prefix, as follows:

If the prefix of the address is saemc:// means reading and writing operations are performed in Memcache , if the prefix is ​​saestor://, it means reading and writing operations are performed in Storage. The prefix is ​​saekv://, which is the operation of KVDB. This is what Wrappers does

The above introduces the problem that Sina sae development cannot write files, including the content. I hope it will be helpful to friends who are interested in PHP tutorials.