如何替换定义为另一个文件中传递的变量的数组值？

Question

I'm working on some function that can accept argument as any array. Some value in this array is defined as variable. This function is class method defined in another file. Is there any way to replace that variable in array by variable defined in method?

The main goal is to have ability to pass $args array with different structure, but there always be a variable $filter_value as value of one array key.

I want to tell method in some way to replace that vaiable with dynamic value that will be passed as $_GET parametr.

So now method accept all args, create array from it, push in global property as array element. And then runing run() method tring to merge two arrays, one of them is passed to method, and there should be placed value insted of $filter_value variable

test.php

$authors_arr = array(
    '5' => 'author_name',
    '7' => 'author_name2',
);
$args = array('author'=>$filter_value);

$dynamic_admin = new DynamicAdmin();
$dynamic_admin->addFilter( 'post', 'author', __('All authors','fn'), $authors_arr, $args);
$dynamic_admin->run();

class.php

class DynamicAdmin{
   private $filter_fn = array();
   public function addFilter($post_type, $meta_key, $label, $value_list, $args){
       $args_arr = compact('post_type', 'meta_key', 'label', 'value_list','args');
       $this->filter_fn[] = $args_arr;
   }
   public function run(){
      foreach ($this->filter_fn as $filter){
         $filter_value = $_GET[$filter['meta_key']];
         $query->query_vars = array_merge($query->query_vars, $filter['args']);
      }
   }
};

For example in current case $filter['meta_key'] = 'author', in my URL there ?auhor=5 and after run() method i want to get $query->query_vars looks like:

Array(
  ...,
  'author' => 5,
  ...,
)

Answer 1

Thanks to @arkascha i've figureed out how to make it possible. Pass array as anonymous function:

$args = function ($value) {
    return array('author'=>$value);
}

pass it as usual

$dynamic_admin->addFilter( 'post', 'author', __('All authors','fn'), $authors_arr, $args);

and call will be

class DynamicAdmin{
   private $filter_fn = array();
   public function addFilter($post_type, $meta_key, $label, $value_list, $args){
       $args_arr = compact('post_type', 'meta_key', 'label', 'value_list','args');
       $this->filter_fn[] = $args_arr;
   }
   public function run(){
      foreach ($this->filter_fn as $filter){
         $filter_value = $_GET[$filter['meta_key']];
         $query->query_vars = array_merge($query->query_vars, $filter['args']( $filter_value ));
      }
   }
};