Hi Please see the following code of my class

class MyClass {
     function __construct() {
        $this->autoload_function();
     }
     
     function autoload_function(){
        $my_array=array("test1");
        foreach ( $my_array as $my_function ){
         call_user_func($my_function);
        }
     }
     
     function test1(){
        echo 'hii- test1';
     }
}

$var = new MyClass();

Here I have to add other values to $my_array and then I have to define other function outside this class . I have to do this via add_action. So I modified the code please see below

my-class.php

class MyClass {
     function __construct() {
        $this->autoload_function();
     }
     
     function autoload_function(){
        $my_array=array("test1");

        do_action('modify_array', $my_array);

        foreach ( $my_array as $my_function ){
         call_user_func($my_function);
        }
     }
     
     function test1(){
        echo 'hii- test1';
     }
}

$var = new MyClass();

my-newpage.php

add_action ('modify_array', 'modify_array_function', 0);


function modify_array_function($my_array){
 array_push($my_array, 'test2')
}

function test2(){
 echo 'hii- test2';
}

Here i can see that new value is added to array but i am not sure about where i can write my new function i am getting following error

Warning: call_user_func() expects parameter 1 to be a valid callback,
class ‘MyClass’ does not have a method
‘test2’

I want to define test2() inside my-newpage.php and I am ready to add more action or filter inside my-class.php

I setup everything in a proper way that’s why add_action (‘modify_array’, ‘modify_array_function’, 0); is working .

Please help.