将“do_action”插入到特定索引（PHP）的数组中

Question

Has anyone ever been able to insert the output from do_action into an array at a specific index? For example, if you have the array and function below:

$myarr = array(1,2,3,4);

 my_function(){
  return 4 + 4;
}

I'm trying to do:

array_splice($myarr, 2, 0, do_action('my_function'););

And have it output:

[1, 2, 8, 3, 4]

I'm trying to integrate something like this in a wordpress page, and it breaks my entire page.

Answer 1

If that's your exact code then the problem is here

array_splice($myarr, 2, 0, do_action('my_function'););

correct line is

array_splice($myarr, 2, 0, my_function());