将数组传递给函数

function a($function, $array)
{
    global $test

    $test->$function(implode(',' $array));
}

For example, I want to be able to pass the various arguments to a second function inside.

So if I passed a('x', array('a', 'b')) it'd execute $test->x('a', 'b');

The imploding obviously doesn't work due to making it a string, not passing arguments, unsure how to do it.

You could use call_user_func_array().

call_user_func_array(array($test, $function), $array);

function a($function, $array)
{
    global $test

    $test->{$function}($array[0], $array[1]);
}

or

function a($function, $arg1, $arg, $arg3...)
{
    global $test
    $arg = func_get_args();
    unset($arg[0]); // because it is the $function arg
    $test->{$function}($arg);
}