Uploading photos to linux server via php - what is the max number of files a folder can have?

There is probably no limit on files, but depending on the filesystem, you want to limit the number of files in a directory to between 1,000 and 10,000. If you have a filesystem that doesn't index directories, even having 1,000 files is going to make file operations slow.

OP, there a few ways that a directory can have so called "limits". One is if disk quota is set. The other depends on filesystem.

For example in this article, it says ext3 has.

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