array_map not allow to pass object in use()

Question

I am trying this:

array_map(function($data) use ($this->id) {
   //code
}, $arr);

I'm getting an error that I can not pass an object to use().

What am I doing wrong?

Thanks

Answer 1

You don't need to pass anything from $this to the closure. $this is available in closures by default. Example:

class A {
    private $id = 500;

    function B() {
        $arr = [1, 2, 3];
        array_map(
            function($data) {
                echo "I'm data $data with id {$this->id}\n";
            },
            $arr
        );
    }
}

$a = new A();
$a->B();

This code will print

I'm data 1 with id 500
I'm data 2 with id 500
I'm data 3 with id 500

Or if you want to pass anything to the use construct instead of using $this directly, just assign your value to a variable and then pass this simple variable to use. You can not list expressions in use.