你必须进行递归搜索：

function searchValueRecursive($array, $value) {
        if (in_array($value, $array)) {
            return true;
        }

        foreach ($array as $element) {
            if (is_array($element) && $this->searchValueRecursive($element, $value)) {
                return true;
            }
        }

        return false;
    }

这是我做的测试：

$jsonString = <<<heredocstring
[
  {
    "id": "someIdentified",
    "name": "someName",
    "files": [
      {"url": "someUrl.ext","urlDescription": "Some Description"},
      {"url": "anotherUrl.ext", "urlDescrition": "Some other Description"}
    ]
  },
  {
    "id": "someIdentified",
    "name": "someName",
    "files": [
      {"url": "someUrl.ext","urlDescription": "Some Description"},
      {"url": "anotherUrl.ext", "urlDescrition": "Some other Description"}
    ]
  },
  {
    "id": "someIdentified",
    "name": "someName",
    "files": [
      {"url": "someUrl.ext","urlDescription": "Some Description find me"},
      {"url": "anotherUrl.ext", "urlDescrition": "Some other Description"}
    ]
  }
]
heredocstring;

$array = json_decode($jsonString, true); // 🟥 pass true to make it an assoc array

            $res = $this->searchValueRecursive($array, 'Some Description find me');