i need curl installed on php. how can i add it using WHM? and does it have any security issue or may couse problem for accounts on the shared host?
From the command line (ssh or physical) run the follow command
EasyApache is a pre configured script that allows you to easily update Apache Web server through WHM or SSH.
It does not cause any trouble, as for the security it depends on how the users use it, depending it could be used to brute-force attack websites which would be a really bad thing.