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!


Question: Execute several times the same php script without timeouts
Answer: 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.