brianhaveri/Underscore.php — Issue #5: "__" is considered reserved in PHP
Author: funkatron
Created: 2011-12-18 20:41:19+00:00
State: open

From (and later )

"PHP reserves all function names starting with __ as magical. It is recommended that you do not use function names with __ in PHP unless you want some documented magic functionality."

This does make me a bit reluctant about using the library. As far as I know there are no existing conflicts, but I worry about the potential down the road.