- [call_user_func](/functions/call_user_func) - [call_user_func_array](/functions/call_user_func_array) - [create_function](/functions/create_function) - [forward_static_call](/functions/forward_static_call) - [forward_static_call_array](/functions/forward_static_call_array) - [func_get_arg](/functions/func_get_arg) - [func_get_args](/functions/func_get_args) - [func_num_args](/functions/func_num_args) - [function_exists](/functions/function_exists) - [get_defined_functions](/functions/get_defined_functions) - [register_shutdown_function](/functions/register_shutdown_function)