I have 2 arrays one with placeholder that are keys in another array

```
arr1 = array(
    "id"       => "{{verticalId}}",
    "itemPath" => "{{verticalId}}/{{pathId}}/");

arr2 = array(
        "verticalId" => "value1",
        "pathId"     => "value2");

```

So how can I run on `arr1` and replace placeholders with value from `arr2` ?