PHP如何从JSON字符串中提取指定的值？

echo $decodeddata['item']['content']['url'];

<?php

$jsonString = '{
    "item": [{
        "media_id": "MEDIA_ID",
        "content": {
            "news_item": [{
                "title": "TITLE",
                "thumb_media_id": "THUMB_MEDIA_ID",
                "show_cover_pic": "0",
                "author": "AUTHOR",
                "digest": "DIGEST",
                "content": "CONTENT",
                "url": "URL",
                "content_source_url": "CONTENT_SOURCE_URL"
            }]
        }
    }]
}';

$decodedData = json_decode($jsonString, true);

echo $decodedData['item'][0]['content']['url'];

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