codeigniter-php parameter is variable, how to invoke the method dynamically?

Such as:
I have three ways to do it now.

foo($a,$b=null)boo($a=array(),$b="")Roo($a)

Now I just need to pass the method name and the argument list to call the method directly.

Hopefully this is possible (pseudo code):

function run_function($fun_name,$paras){    {$fun_name}(....//这里应该怎么写呢？);}

I found the correct answer, thanks to the following two replies, but really not the answer I need. The solution is now posted:

$handler = array( 'test', 'test3');$params = array(    array(1,2,3,4),    1);if($params == null){    call_user_func($handler);}if (is_callable($handler) ){    call_user_func_array( $handler , $params );}class test{    function test1($arr,$arr1)    {        var_dump(array_merge($arr,$arr1));    }    function test2()    {        echo 123;    }    function  test3($arr,$a)    {        var_dump($arr);        var_dump($a);    }}

Reply content:

Such as:
I have three ways to do it now.

foo($a,$b=null)boo($a=array(),$b="")Roo($a)

Now I just need to pass the method name and the argument list to call the method directly.

Hopefully this is possible (pseudo code):

function run_function($fun_name,$paras){    {$fun_name}(....//这里应该怎么写呢？);}

I found the correct answer, thanks to the following two replies, but really not the answer I need. The solution is now posted:

$handler = array( 'test', 'test3');$params = array(    array(1,2,3,4),    1);if($params == null){    call_user_func($handler);}if (is_callable($handler) ){    call_user_func_array( $handler , $params );}class test{    function test1($arr,$arr1)    {        var_dump(array_merge($arr,$arr1));    }    function test2()    {        echo 123;    }    function  test3($arr,$a)    {        var_dump($arr);        var_dump($a);    }}

http://www.php.net/manual/zh/function.func-get-args.php

function run_function($fun_name){    if(function_exists($fun_name))    {        $num = func_num_args();                $args = func_get_args();        array_shift($args);        return $num==1 ? call_user_func($fun_name) : call_user_func_array($fun_name,$args);    }    trigger_error('Call to undefined function ' . $fun_name, E_USER_ERROR);}//使用run_function('foo', $a, $b);run_function('boo', $a, $b);run_function('Roo', $a);

The ignored answer can be fulfilled.

