TypeScrypt oneliner to PHP : I'm translating a code from TypeScrypt to PHP and that's going well so far.
In TypeScrypt there are some oneliners that I need to translate but I don't seem te get it right.

The TypeScrypt code is:

`const InContent: string = subclass.Ins
        .map((In: In) => In.OutId + In.OutIndex)
        .reduce((a, b) => a + b, '');`

Now I know that PHP 7 has functions like `array_map`, `array_reduce` and `array_column`.
I think it is possible to create this TypeScript oneliner also in PHP as a oneliner, but I can't see how.

Is there someone that can help me with this?
Thanks in advanced!