Doctrine 2 ODM MongoDB storing images in GridFS from memory

i want to store uploaded files in mongodb as GridFsFile. Im using the doctrine 2开发者_运维技巧 odm. it works fine when i read a file from disk and store it. But what i would like to achieve is to avoid storing the uploaded files anywhere on file system.

Is it possible to store the binary string directly?

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According to the answer to this question, PHP always writes uploaded files to a temporary directory, and the _FILES array just points to those uploaded files.

You might consider setting PHP's upload_tmp_dir to a directory you've mounted as tmpfs or ramfs to avoid writing the files to disk. see here for a comparison of the two memory-based file systems.