I don’t want an other application to read the files while this php app upload/overwrites files to the remote server
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I don’t want an other application to read the files while this php app upload/overwrites files to the remote server
There is no such thing as locking/unlocking files with ftp. Maybe some server can implement this kind of thing, but it should be non-standard. So, PHP is not managing this kind of thing.
By the way, depending your case, you can upload your file into a temporary directory and then rename it. Renaming is an atomic procedure, and it can be the right way to avoid your clients to download an non-finished upload file.