call_user_func   2968 ext/standard/basic_functions.c 	PHP_FE(call_user_func,													arginfo_call_user_func)
call_user_func   4763 ext/standard/basic_functions.c PHP_FUNCTION(call_user_func)
call_user_func     86 ext/standard/basic_functions.h PHP_FUNCTION(call_user_func);