PHP-从无效的json中删除密钥

问题描述：

I am new to php and dont know how to deal with invalid json. So I want to remove those keys which have invalid string values

Here tag_list and description have invalid string values.

$json='{
    "kind": "track",
    "id": 132453675,
    "created_at": "2014/02/01 02:01:11 +0000",
    "user_id": 895073,
    "duration": 323242,
    "commentable": true,
    "state": "finished",
    "original_content_size": 7745028,
    "last_modified": "2014/02/23 15:48:45 +0000",
    "sharing": "public",
    "tag_list": "hi " how are",
    "permalink": "leaman",
    "streamable": true,
    "embeddable_by": "all",
    "downloadable": false,
    "purchase_url": null,
    "label_id": null,
    "purchase_title": null,
    "genre": "Pop",
    "title": "Leaman",
    "description": "what"" is for",
    "label_name": null,
    "release": null,
    "track_type": null,
    "key_signature": null,
    "isrc": null,
    "video_url": null,
    "bpm": null,
    "release_year": null,
    "release_month": null,
    "release_day": null,
    "original_format": "mp3",
    "license": "all-rights-reserved",
    "uri": "https://api.soundcloud.com/tracks/132453675",
    "user": {
        "id": 895073,
        "kind": "user",
        "permalink": "cloudsareghosts",
        "username": "cloudsareghosts",
        "last_modified": "2014/02/13 22:16:09 +0000",
        "uri": "https://api.soundcloud.com/users/895073",
        "permalink_url": "http://soundcloud.com/cloudsareghosts",
        "avatar_url": "https://i1.sndcdn.com/avatars-000005407842-c7dt3c-large.jpg"
    },
    "permalink_url": "http://soundcloud.com/cloudsareghosts/leaman",
    "artwork_url": "https://i1.sndcdn.com/artworks-000069579796-mhc0bg-large.jpg",
    "waveform_url": "https://w1.sndcdn.com/r4xyDo8zqpfU_m.png",
    "stream_url": "https://api.soundcloud.com/tracks/132453675/stream",
    "playback_count": 253,
    "download_count": 0,
    "favoritings_count": 4,
    "comment_count": 0,
    "attachments_uri": "https://api.soundcloud.com/tracks/132453675/attachments",
    "policy": "ALLOW"
}';

So how can I remove these keys tag_list and description from this json in php.

Thanks

答

Seems like the double quotes messes up the JSON. You would have to replace these " with \"

So: "description": "what"" is for", should be "description": "what\"\" is for",

Depending on how you get the JSON, you could str_replace this with PHP instead of doing it manually. For example, if this JSON is created by a script of your own, you could edit that to make sure it outputs the backward slashes with it. (Looping of the object and relacing double quotes in the values by \".)

EDIT: Example in PHP:

$json = preg_replace_callback(
    '/^([^"]*"[^*]+": )"(.*?)"(.*)$/mU',
    function ($matches) {
        return $matches[1].'"'.str_replace('"', '\"', $matches[2]).'"'.$matches[3];
    },
    $json);

This preg_replace_callback replaces the double quotes inside value declarations to \". See it here: https://eval.in/294426

PHP-从无效的json中删除密钥

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