#BASH + BrainF*ck + PHP, 269 characters# #>< echo Just another BASH hacker #++++++++++[>+++++++>++++++++++++>++++++++++>+++++++++++>+++>+<<<<<<-]>++++.>---.--.+.>>>++.<<---.>.+.<<.>+++++++.---.>+++.>.<<<<<++++[>--<-]>.++++.>>>>.<<+++.-------.++.>-------.<++.>+++++++.>>.
BASH + BrainF*ck + PHP, 269 characters
#><?="Just another PHP hacker\n";die();?>< echo Just another BASH hacker #++++++++++[>+++++++>++++++++++++>++++++++++>+++++++++++>+++>+<<<<<<-]>++++.>---.--.+.>>>++.<<---.>.+.<<.>+++++++.---.>+++.>.<<<<<++++[>--<-]>.++++.>>>>.<<+++.-------.++.>-------.<++.>+++++++.>>. Running the program:
$ php langs.sh #>Just another PHP hacker $ ./2langs.sh Just another BASH hacker $ bf 2langs.sh Just another BF hacker A bit of stretching the rules with that PHP one, but it seems to work. I can fix it if it doesn't count.