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@ 2018-06-22T09:42:09Z

<?php
$str = '{
        "capacity_test": {
          "date": "2017-03-01",
          "status": "done",
          "PROPERTIES": {
            "fail": {
              "capacity_test": {
                "date": "2017-03-02",
                "status": "done",
                "PROPERTIES": {
                  "boolean": false
                }
              },
              "def": [
                {
                  "drop_test": {
                    "Properties": {
                      "date": "2017-03-05",
                      "status": "done"
                    }
                  },
                  "waves_test": {
                    "date": "2018-03-06",
                    "status": "done"
                  }
                },
                {
                  "drop_test": {
                    "Properties": null
                  },
                  "waves_test": {
                    "date": "2018-03-06",
                    "status": "done"
                  }
                },
                {
                  "drop_test": {
                    "Properties": null
                  },
                  "waves_test": {
                    "date": "2018-03-06",
                    "status": ""
                  }
                }
              ]
            },
            "final_test": {
              "Properties": null
            }
          }
        }
      }';

$array = json_decode($str, true); // Convert JSON string to array
$hasEmptyStatus = false;

try {
    array_walk_recursive($array, function($item, $key) {
        if ($key == "status" && $item == "") {
            throw new Exception;
        }
    });
} catch(Exception $e) {
    $hasEmptyStatus = true;
}

var_dump($hasEmptyStatus);

Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13: bool(true)

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