POSIX_GETPGRP(3) 1 POSIX_GETPGRP(3) posix_getpgrp - Return the current process group identifierSYNOPSISint posix_getpgrp (void )DESCRIPTIONReturn the process group identifier of the current process.RETURN VALUESReturns the identifier, as an integer.SEE ALSOPOSIX.1 and the getpgrp(2) manual page on the POSIX system for more information on process groups.. PHP Documentation Group POSIX_GETPGRP(3)