PHP takes out JSON returns null

The code is as follows:

  
    $obj->songs[0]->bMusic->name,    "artist" => $obj->songs[0]->artists[0]->name,    "url" => $obj->songs[0]->mp3Url);echo json_encode($array);?>

The JSON file is roughly like this:

{"Songs": [{"Starred": false, "popularity": Up, "Starrednum": 0, "Playednum": 0, "Dayplays": 0, "Heartime": 0, "Mp3url": "Http://m2.music.126.net/2b980AHt            Vx18bj_z9mhkxa==/2830142929914115.mp3 "," Rturls ": []," status ": 1," CRBT ": null,                 "Bmusic": {"Volumedelta": 0.095421, "playTime": 200000, "bitrate": 96000,                "Dfsid": 2830142929914115, "sr": 44100, "name": "Set Fire to the Rain", "id": 24667967, "size": 2436177, "extension": "MP3"}, "RtU                RL ": null," position ": 2," duration ": 200000," Alias ": []," Hmusic ": {  "Volumedelta": -0.05, "playTime": 200000, "bitrate": 320000, "Dfsid":      2830142929914113,          "SR": 44100, "name": "Set Fire to the Rain", "id": 24667965, "size"                : 8056892, "extension": "MP3"}, "Mmusic": {"Volumedelta": 0.41,                "PlayTime": 200000, "bitrate": 160000, "Dfsid": 2830142929914114,                 "SR": 44100, "name": "Set Fire to the Rain", "id": 24667966, "size": 4042394,                "Extension": "MP3"}, "Lmusic": {"Volumedelta": 0.095421, "PlayTime": 200000, "bitrate": 96000, "Dfsid": 2830142929914115, "SR": 4                4100, "name": "Set Fire to the Rain", "id": 24667967, "size": 2436177,                "Extension": "MP3"}, "album": {"songs": [], "paid": false, "OnSale": False, "status": 1, "tags": "", "Blurpicurl": "HTTP://P4.MUSIC.126.NET/J32CG                J_dq-4wpfs4u9sjwa==/2539871860943087.jpg "," CompanyID ": 0," pic ": 2539871860943087, "description": "", "subtype": null, "Alias": [], "picid": 253987186094 3087, "Briefdesc": "", "Artist": {"Img1v1id": 0, "Ali As ": []," Picid ": 0," Briefdesc ":" "," Picurl ":" Http://p4.music.  126.net/6y-uleoritedbvrolv0q8a==/5639395138885805.jpg "," Albumsize ": 0," Img1v1url ":                    "Http://p3.music.126.net/6y-UleORITEDbvrOLV0Q8A==/5639395138885805.jpg", "Trans": "", "Musicsize": 0, "name": "", "id": 0}, "Picurl": "H Ttp://p4.music.126.net/j32cgj_dq-4wpfs4u9sjwa==/2539871860943087.jpg "," Commentthreadid ":" r_al_3_1983765 "," artists                        ": [{" Img1v1id ": 0," Alias ": [], "Picid": 0, "Briefdesc": "", "Picurl": "Http://p4.music.126.net/6y-UleORITE Dbvrolv0q8a==/5639395138885805.jpg "," Albumsize ": 0," Img1v1url ":" Http://p3                        . Music.126.net/6y-uleoritedbvrolv0q8a==/5639395138885805.jpg "," Trans ":" ",                    "Musicsize": 0, "name": "Piano Tribute Players", "id": 99094 }], "Copyrightid": 0, "publishtime": 1321804800000, "comp Any ': ' CC entertainment ', ' name ': ' Piano tribute to Adele ', ' id ': 1983765, ' t             Ype ":" album ",   "Size": "Commentthreadid": "r_so_4_21515271", "artists": [{ "Img1v1id": 0, "Alias": [], "Picid": 0, "Briefdesc                    ":" "," Picurl ":" Http://p3.music.126.net/6y-UleORITEDbvrOLV0Q8A==/5639395138885805.jpg ", "Albumsize": 0, "Img1v1url": "HTTP://P4.MUSIC.126.NET/6Y-ULEORITEDBVROLV0Q8A==/5639395138885805.J PG "," Trans ":" "," Musicsize ": 0," name ":" Piano Tribute Players "            , "id": 99094}], "Copyrightid": 0, "score": 95, "Fee": 0, "Mvid": 0, "ftype": 0, "Rtype": 0, "Rurl": null, "C            Opyfrom ":", "audition": null, "Ringtone": "", "Disc": "", "No": 2, "Name": "Set fire to THe Rain "," id ": 21515271}]," Equalizers ": {}," code ": 200} 

Upload to host page output result:

Notice:trying to get property of Non-object in on line 6 {"name": null, "Artist": "Piano Tribute Players", "url": null}

Reply content:

The code is as follows:

  
    $obj->songs[0]->bMusic->name,    "artist" => $obj->songs[0]->artists[0]->name,    "url" => $obj->songs[0]->mp3Url);echo json_encode($array);?>

The JSON file is roughly like this:

{"Songs": [{"Starred": false, "popularity": Up, "Starrednum": 0, "Playednum": 0, "Dayplays": 0, "Heartime": 0, "Mp3url": "Http://m2.music.126.net/2b980AHt            Vx18bj_z9mhkxa==/2830142929914115.mp3 "," Rturls ": []," status ": 1," CRBT ": null,                 "Bmusic": {"Volumedelta": 0.095421, "playTime": 200000, "bitrate": 96000,                "Dfsid": 2830142929914115, "sr": 44100, "name": "Set Fire to the Rain", "id": 24667967, "size": 2436177, "extension": "MP3"}, "RtU                RL ": null," position ": 2," duration ": 200000," Alias ": []," Hmusic ": {  "Volumedelta": -0.05, "playTime": 200000, "bitrate": 320000, "Dfsid":      2830142929914113,          "SR": 44100, "name": "Set Fire to the Rain", "id": 24667965, "size"                : 8056892, "extension": "MP3"}, "Mmusic": {"Volumedelta": 0.41,                "PlayTime": 200000, "bitrate": 160000, "Dfsid": 2830142929914114,                 "SR": 44100, "name": "Set Fire to the Rain", "id": 24667966, "size": 4042394,                "Extension": "MP3"}, "Lmusic": {"Volumedelta": 0.095421, "PlayTime": 200000, "bitrate": 96000, "Dfsid": 2830142929914115, "SR": 4                4100, "name": "Set Fire to the Rain", "id": 24667967, "size": 2436177,                "Extension": "MP3"}, "album": {"songs": [], "paid": false, "OnSale": False, "status": 1, "tags": "", "Blurpicurl": "HTTP://P4.MUSIC.126.NET/J32CG                J_dq-4wpfs4u9sjwa==/2539871860943087.jpg "," CompanyID ": 0," pic ": 2539871860943087, "description": "", "subtype": null, "Alias": [], "picid": 253987186094 3087, "Briefdesc": "", "Artist": {"Img1v1id": 0, "Ali As ": []," Picid ": 0," Briefdesc ":" "," Picurl ":" Http://p4.music.  126.net/6y-uleoritedbvrolv0q8a==/5639395138885805.jpg "," Albumsize ": 0," Img1v1url ":                    "Http://p3.music.126.net/6y-UleORITEDbvrOLV0Q8A==/5639395138885805.jpg", "Trans": "", "Musicsize": 0, "name": "", "id": 0}, "Picurl": "H Ttp://p4.music.126.net/j32cgj_dq-4wpfs4u9sjwa==/2539871860943087.jpg "," Commentthreadid ":" r_al_3_1983765 "," artists                        ": [{" Img1v1id ": 0," Alias ": [], "Picid": 0, "Briefdesc": "", "Picurl": "Http://p4.music.126.net/6y-UleORITE Dbvrolv0q8a==/5639395138885805.jpg "," Albumsize ": 0," Img1v1url ":" Http://p3                        . Music.126.net/6y-uleoritedbvrolv0q8a==/5639395138885805.jpg "," Trans ":" ",                    "Musicsize": 0, "name": "Piano Tribute Players", "id": 99094 }], "Copyrightid": 0, "publishtime": 1321804800000, "comp Any ': ' CC entertainment ', ' name ': ' Piano tribute to Adele ', ' id ': 1983765, ' t             Ype ":" album ",   "Size": "Commentthreadid": "r_so_4_21515271", "artists": [{ "Img1v1id": 0, "Alias": [], "Picid": 0, "Briefdesc                    ":" "," Picurl ":" Http://p3.music.126.net/6y-UleORITEDbvrOLV0Q8A==/5639395138885805.jpg ", "Albumsize": 0, "Img1v1url": "HTTP://P4.MUSIC.126.NET/6Y-ULEORITEDBVROLV0Q8A==/5639395138885805.J PG "," Trans ":" "," Musicsize ": 0," name ":" Piano Tribute Players "            , "id": 99094}], "Copyrightid": 0, "score": 95, "Fee": 0, "Mvid": 0, "ftype": 0, "Rtype": 0, "Rurl": null, "C            Opyfrom ":", "audition": null, "Ringtone": "", "Disc": "", "No": 2, "Name": "Set fire to THe Rain "," id ": 21515271}]," Equalizers ": {}," code ": 200} 

Upload to host page output result:

Notice:trying to get property of Non-object in on line 6 {"name": null, "Artist": "Piano Tribute Players", "url": null}

JSON also has two commands:
Json_last_error_msg This is the error message that gets the JSON.
Json_last_error returns the last error that occurred
You can try these two commands to see what's wrong with Json_encode.

Remember to read the PHP manual on a similar wording:

$obj->{$music->name}

This kind of, do not know whether there is any relationship ...
(similar to the scene I used to use more than the array, I feel in PHP more useful than the object ...) Beginner to Forgive ~)

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