php array replace upto same depth

I'm building a binary tree where I have two arrays. First array has empty tree structure and second array has actual values. Below are the structure of both arrays.

First Array

  "157": {
    "id": "157",
    "username": "username",
    "children": [
      {
        "id": "-1",
        "parent_id": "0",
        "username": "NULL",
        "position": "",
        "children": [
          {
            "id": "-1",
            "parent_id": "0",
            "username": "NULL",
            "position": "",
            "children": [
              {
                "id": "-1",
                "parent_id": "0",
                "username": "NULL",
                "position": "",
                "children": []
              }
            ]
          }
        ]
      }
    ]
  }
}
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Second Array

  "157": {
    "id": "157",
    "position": 1,
    "username": "test1",
    "parent_id": null,
    "children": [
      {
        "id": "158",
        "position": 1,
        "parent_id": "157",
        "username": "test1",
        "children": [
          {
            "id": "159",
            "position": 1,
            "parent_id": "158",
            "username": "test2",
            "children": [
              {
                "id": "160",
                "position": 1,
                "parent_id": "159",
                "username": "test3",
                "children": []
              }
            ]
          }
        ]
      }
    ]
  }
}
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I'm usingarray_replace_recursive function to replace empty values with actual value. It is working fine when both the arrays have same depth. For example if first array has 3 depth and second array also has 3 depth then it is working fine, but if second array has more values then first array then it is breaking array tree structure. So now I want to replace values upto depth of first array, no matter how big is second array, just replace values upto the depth first array. Is this really possible?

Thank you!

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