check if HTTP_USER_AGENT exists.
check if HTTP_USER_AGENT exists.
ccfelix/doophp,mustafakarali/doophp,AbdullahFaqeir/doophp,rhizalpatrax64bit/doophp,somkidodd/doophp,rhizalpatrax64bit/doophp,somkidodd/doophp,AbdullahFaqeir/doophp,mustafakarali/doophp,AbdullahFaqeir/doophp,ccfelix/doophp,rhizalpatrax64bit/doophp,mythinking/doophp,ccfelix/doophp,somkidodd/doophp,mythinking/doophp,mustafakarali/doophp,mythinking/doophp