Apache will run your script multiple times; why would it care?

If generating the report takes more than 2 minutes, the browser itself will usually timeout and stop waiting.

The typical trick here is to have the "generate" process run in a separate thread, so it can complete in its own time.

I don't have a sense as to why the second user is blocked, but I'd think there's something blocking in your script.

Execute several times the same php script without timeouts
My question is how to create multiple raster layers group, for example when using several aerial photos. I wish to group the layers into one so that I can edit/select as a batch rather than having to click on individual layers.

I use ArcGIS 10.2.

Thank you in advance!
