Parsing JSON - getting null output - PHP

Question

My code:

$json_response = json_decode($response, true);
$tag= $json_response['results']['tags'][0]['tag'];
print $tag;

My JSON:

{
  "results": [
    {
      "tagging_id": null,
      "image": "image.jpg",
      "tags": [
        {
          "confidence": 100,
          "tag": "herb"
        },
        {
          "confidence": 98.3637619018555,
          "tag": "plant"
        }
      ]
    }
  ]
}

I am trying to output "herb". I have looked up through examples but cannot figure out where the bug is.

I am reading results and then the trees.

Answer 1

您必须获取['results']的第一个元素。

echo $json_response['results'][0]['tags'][0]['tag'];