Как извлечь json из html string php

Question

Это строка, которую я получил с мобильного сайта youtube. Я хочу извлечь json, используя php.

$str = ")]}'{\"conn\": \"wifi\", \"content\": {\"pyv_ping_url\": null, \"subscription_state\": {\"subscribe_url\": {\"url\": \"\\\/channel_post?feature=watch\\u0026action_subscribe=1\", \"channel_id\": \"UCeQEKFH31vvD-InkTGSvCrA\"}, \"show_button\": true, \"is_subscribed\": false}, \"distiller_config\": {\"owner_id\": \"eQEKFH31vvD-InkTGSvCrA\", \"visible\": null, \"pinned_activity\": null, \"channel_id\": \"UCeQEKFH31vvD-InkTGSvCrA\", \"privacy_setting\": \"PUBLIC\", \"query\": \"http:\\\/\\\/www.youtube.com\\\/watch?v=C5tOEBmBAHg\", \"signin_url\": \"https:\\\/\\\/accounts.google.com\\\/ServiceLogin?service=youtube\\u0026passive=true\\u0026uilel=3\\u0026hl=en_US\\u0026ltmpl=mobile\\u0026continue=http%3A%2F%2Fm.youtube.com%2Fsignin%3Faction_handle_signin%3Dtrue%26feature%3Ddistiller%26hl%3Den_US%26next%3D%252Fwatch%253Fv%253DC5tOEBmBAHg%2526client%253Dmv-google%26nomobiletemp%3D1\", \"video_id\": \"C5tOEBmBAHg\", \"debug\": false, \"filter_premod\": false}, \"allow_comments\": true, \"ad_instream\": \"\", \"show_pyv_in_related\": false, \"player_data\": 
    {\"fmt_stream_map\": [{\"itag\": \"18\", \"type\": \"video\\\/mp4; codecs=\\\"avc1.42001E, mp4a.40.2\\\"\", \"fallback_host\": \"tc.v6.cache1.c.youtube.com\", \"quality\": \"medium\", \"url\": \"http:\\\/\\\/r4---sn-nau-jhcl.c.youtube.com\\\/videoplayback?ms=au\\u0026itag=18\\u0026mt=1378896627\\u0026app=youtube_mobile\\u0026mv=m\\u0026source=youtube\\u0026sver=3\\u0026expire=1378918433\\u0026sparams=cp%2Cid%2Cip%2Cipbits%2Citag%2Cratebypass%2Csource%2Cupn%2Cexpire\\u0026cp=U0hWTVlMVl9ITUNONl9RRlpFOkV6dktxMFVBYU1Y\\u0026upn=kjDilUW5IQE\\u0026ip=124.43.93.65\\u0026dnc=1\\u0026el=watch\\u0026yms=FcwHm3XWaNY\\u0026ratebypass=yes\\u0026key=yt1\\u0026signature=06D949BF71135F49A3BE9E7A47182B2A61DCF915.5B86FC625C760F1402BC700C660E61CC69684992\\u0026id=0b9b4e1019810078\\u0026fexp=907724%2C906942%2C924606%2C929117%2C929121%2C929906%2C929907%2C929922%2C929127%2C929129%2C929131%2C929930%2C936403%2C925726%2C936310%2C925720%2C925722%2C925718%2C925714%2C929917%2C906945%2C929933%2C920302%2C906842%2C913428%2C919811%2C913563%2C919373%2C930803%2C908536%2C938701%2C931924%2C936308%2C909549%2C900816%2C912711%2C904494%2C904497%2C939903%2C900375%2C900382%2C934507%2C907231%2C936312%2C906001\\u0026ipbits=8\"}, {\"itag\": \"36\", \"type\": \"video\\\/3gpp; codecs=\\\"mp4v.20.3, mp4a.40.2\\\"\", \"fallback_host\": \"tc.v23.cache2.c.youtube.com\", \"quality\": \"small\", 
    \"url\": \"http:\\\/\\\/r4---sn-nau-jhcl.c.youtube.com\\\/videoplayback?ms=au\\u0026itag=36\\u0026mt=1378896627\\u0026app=youtube_mobile\\u0026mv=m\\u0026source=youtube\\u0026sver=3\\u0026expire=1378918433\\u0026sparams=cp%2Cid%2Cip%2Cipbits%2Citag%2Cratebypass%2Csource%2Cupn%2Cexpire\\u0026cp=U0hWTVlMVl9ITUNONl9RRlpFOkV6dktxMFVBYU1Y\\u0026upn=kjDilUW5IQE\\u0026ip=124.43.93.65\\u0026dnc=1\\u0026el=watch\\u0026yms=FcwHm3XWaNY\\u0026ratebypass=yes\\u0026key=yt1\\u0026signature=663C16B74F22132913A4E86CFE733CEFC10C18C3.175EA19B37241399C17305FAACEFB07A1C5FB2DD\\u0026id=0b9b4e1019810078\\u0026fexp=907724%2C906942%2C924606%2C929117%2C929121%2C929906%2C929907%2C929922%2C929127%2C929129%2C929131%2C929930%2C936403%2C925726%2C936310%2C925720%2C925722%2C925718%2C925714%2C929917%2C906945%2C929933%2C920302%2C906842%2C913428%2C919811%2C913563%2C919373%2C930803%2C908536%2C938701%2C931924%2C936308%2C909549%2C900816%2C912711%2C904494%2C904497%2C939903%2C900375%2C900382%2C934507%2C907231%2C936312%2C906001\\u0026ipbits=8\"}], \"playability\": \"PLAY_OK\", \"player_type\": \"html5fs\"}, \"subscribe_xsrf_token\": \"V-JkAZNXVIi4gjwRIRaUyy1rqh98MTM3ODk4MzA2MUAxMzc4ODk2NjYx\", \"channel_subscriber_count\": 1445686, \"should_prompt_merge_identity\": false, \"branding\": null, \"sentiment_xsrf_token\": \"rUe1DX9B6S0kBEJwaYYRBQkgw1J8MTM3ODk4MzA2MUAxMzc4ODk2NjYx\", \"ptracking\": \"\\\/\\\/www.youtube.com\\\/ptracking?ptk=brusspup%252Buser\\u0026pltype=content\\u0026oid=3OmbD_Dz3bv1YwNAoU8c6A\\u0026ptchn=brusspup\\u0026video_id=C5tOEBmBAHg\", \"next_url\": \"\\\/related?v=C5tOEBmBAHg\\u0026page=2\", \"allow_ratings\": true, \"video\": {\"user_image_url\": \"\\\/\\\/i1.ytimg.com\\\/i\\\/eQEKFH31vvD-InkTGSvCrA\\\/1.jpg?v=4efb5240\", \"time_created_text\": \"Sep 4, 2013\", \"duration\": \"2:09\", \"view_count\": \"2,767,499\", \"title\": \"Incredible Chemical Reaction!\", \"thumbnail_info\": null, \"comment_count\": 4367, \"dislikes_num\": 1203, \"longform\": false, \"profile_url\": \"\\\/user\\\/brusspup\", \"thumbnail_for_watch\": \"http:\\\/\\\/i.ytimg.com\\\/vi\\\/C5tOEBmBAHg\\\/hqdefault.jpg?w=320\\u0026h=192\\u0026sigh=yvFlZe6HDNoAvIPVEiRBbyEUDAw\", \"likes_num\": 21801, \"watch_link\": \"\\\/watch?v=C5tOEBmBAHg\", \"encrypted_id\": \"C5tOEBmBAHg\", \"description\": \"Add me on Facebook. (click LIKE on Facebook to add me) \\nhttp:\\\/\\\/www.facebook.com\\\/brusspup\\n\\n\\nDownload the song in this video:\\nSong name: Monolith\\n\\niTunes\\nhttps:\\\/\\\/itunes.apple.com\\\/us\\\/album\\\/monolith-single\\\/id596457486\\n\\nAmazon\\nhttp:\\\/\\\/www.amazon.com\\\/Monolith\\\/dp\\\/B00B60NGFY\\\/ref=sr_1_1?ie=UTF8\\u0026qid=1378343773\\u0026sr=8-1\\u0026keywords=monolith+brusspup\\n\\nThere are no editing tricks in the video. All of the reactions that you see are uncut and play at the original speed.\\n\\nThis is a classic chemical reaction. It's called the iodine clock reaction. There are several variations of how this chemical reaction can be performed using different chemicals than the ones I used in the video. You can order clock reaction kits from several science related websites. You can also use simple store bought chemicals like vitamin C, iodine, hydrogen peroxide and starch. A quick internet search will turn up multiple ways of performing the experiment.\\n\\nEven though I've played around with the clock reaction experiment before I've always wanted to capture the reaction as the liquid was being poured. 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Answer 1

Строка не является действительным JSON - Первые несколько символов )]}' - Учитывая, вы вручную создали строку, вы можете просто удалить их, а затем использовать json_decode

var_dump(json_decode($str)); 

или динамически с помощью substr()

json_decode(substr($str, 4));