PHP中的Ruby映射函数？

I am really used to programming in Ruby. I am working in PHP now.

I have an array of objects, and I want to get all the ids of those objects and put them in an array.

In Ruby you would do:

my_arr.map { |arr| arr.id }

How would I do that in PHP? Do I need to do a foreach and push that id into an array?

You have array_map. For example:

$my_arr = array_map(function($el) { 
    return $el['id'];
}, $arr);