在所有数组成员上调用对象成员函数

Question

This may be a bit of a silly question and its one of convenience rather than functionality.

Assume we have the class:

class A { 
    public function getId() {
       return rand(0,100); //For simplicity's sake
    }
}

Let's say we have an array of objects of type A, e.g. $array = [ new A(), new A(), new A() ];

Normally if I want to transform the array of all objects into an array of their IDs I'd do something like:

$idArray = array_map(function ($a) { return $a->getId(); }, $array);

However this leaves me with a sort of burning desire to simplify this (I use it quite often). I would like a functionality like:

$idArray = magic_array_map('getId', $array);

My question is, is there a way to call array_map (or similar function) by providing the function name instead of an actual callback? Something akin to array_map('count', $array) but instead of strlen provide a member method name.

In short, is there such a way built-in PHP or do I have to implement an array_map of my own to add this functionality?

Answer 1

You can create your own helper function to do what you want.

my_map_function($callback, $array) {
    return call_user_func_array(callback, $array);
}

my_callback_function($array) {
  //TODO
}

main() {
  $array = [1, 2, 3];
  $array = my_map_function('my_callback_function', $array);
}

Something like this ;)

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