Extraer parte especifica de codigo

[after]

Hola a todos

Dentro del siguiente código necesito extraer una parte de él:

Código Javascript:

<script type="text/javascript">_main('\/file\/d\/0Bya7uRIlM1kWN3g4cUZhNFpULWM', {'sid': '40fb345b33affb60','id': '0Bya7uRIlM1kWN3g4cUZhNFpULWM', 'email': '', 'title': 'Dexter.S07E01.HDTV.XviD-MGD.avi', 'description': '', 'mimetype': 'video\/x-msvideo', 'fileExtension': 'avi', 'mediaType': 'video', 'revisions': [{"tags":[],"creatorDisplayName":"leonardo da vinci","pinned":true,"filename":"Dexter.S07E01.HDTV.XviD-MGD.avi","downloadUrl":"https://docs.google.com/uc?id=0Bya7uRIlM1kWN3g4cUZhNFpULWM&export=download&revid=0Bya7uRIlM1kWZXllUDRLWjZ6UjQ5VDdEeWtPZ3ZpKzVWdXVFPQ","sizeInBytes":578695468,"docId":"0Bya7uRIlM1kWZXllUDRLWjZ6UjQ5VDdEeWtPZ3ZpKzVWdXVFPQ","creationDateString":"28/12/12","creator":{"isMe":false,"nickname":"leonardo da vinci","iconUrl":"images/doclist/contact_nopicture.png","editProfileUrl":"editProfile"}}],'obfuscatedUserId': 'ANONYMOUS_17612595759507348808','userDomain': '', 'embedPreviewUri': 'https:\/\/docs.google.com\/file\/d\/0Bya7uRIlM1kWN3g4cUZhNFpULWM\/preview','syncUpdates': [],'contentRenderer': 'video'},{"description":{"raw":"","formatted":""},"download":{"isMissingBlobRef":false,"filename":"Dexter.S07E01.HDTV.XviD-MGD.avi","url":"https://docs.google.com/uc?id=0Bya7uRIlM1kWN3g4cUZhNFpULWM&export=download"},"revision":{"swfUrl":"/static/doclist/client/css/1531528182-uploaderapi.swf","busyIconImageUrl":"https://ssl.gstatic.com/docs/doclist/images/loading_small.gif"},"sharing":{"is_private":false,"visibility_is_restricted_to_domain":false,"visibility_domain_display_name":""},"basicdetails":{"mimeType":"video/x-msvideo","lastModifiedDateString":"28/12/12","creationDateString":"28/12/12","fileSize":"578695468"},"videodetails":{"duration":3282140,"formattedDuration":"54:43","width":640,"height":352,"videoFps":23.976,"videoBitrate":1278920.0,"audioBitrate":128001.0},"thumbnail":{"thumbnail_128":"https://lh4.googleusercontent.com/BqcBvxZ4_8jOGy9d7PY7oncR3m3BC5mzYrKorTQrtoP9BjxG9ED9WyXE28Ap0GanwwMd=s128","thumbnail_full":"https://lh4.googleusercontent.com/BqcBvxZ4_8jOGy9d7PY7oncR3m3BC5mzYrKorTQrtoP9BjxG9ED9WyXE28Ap0GanwwMd=s1600"},"videoplay":{"vid":"857d340b237d4fb0","status":"AVAILABLE","width":640,"height":352,"duration":3282140,"embedType":"PREFER_FLASH","swfUrl":"https://video.google.com/get_player?el=leaf&cc_load_policy=1","embeduri":"https://video.google.com/get_player?docid=0Bya7uRIlM1kWN3g4cUZhNFpULWM&ps=docs&partnerid=30&cc_load_policy=1","iframeEmbedUri":"https://www.youtube.com/iframe_api?html5=1&docid=0Bya7uRIlM1kWN3g4cUZhNFpULWM&ps=docs&partnerid=30&cc_load_policy=1","flashVars":{"status":"ok","hl":"es_419","allow_embed":"0","ps":"docs","partnerid":"30","autoplay":"0","docid":"0Bya7uRIlM1kWN3g4cUZhNFpULWM","abd":"0","public":"false","el":"leaf","title":"Dexter.S07E01.HDTV.XviD-MGD.avi","iurl":"https://docs.google.com/vt?id=0Bya7uRIlM1kWN3g4cUZhNFpULWM","ttsurl":"https://docs.google.com/timedtext?id=0Bya7uRIlM1kWN3g4cUZhNFpULWM&vid=857d340b237d4fb0","reportabuseurl":"https://docs.google.com/abuse?id=0Bya7uRIlM1kWN3g4cUZhNFpULWM","token":"1","plid":"V0QTgcVJR4Lv_g","fmt_stream_map":"18|https://r3---sn-hp576nee.c.docs.google.com/videoplayback?requiressl=yes&shardbypass=yes&cmbypass=yes&id=857d340b237d4fb0&itag=18&source=webdrive&app=docs&ip=181.50.157.34&ipbits=0&expire=1405625079&sparams=requiressl,shardbypass,cmbypass,id,itag,source,ip,ipbits,expire&signature=49F5D7FC85FB145751263FEA498969631F1CE06B.A5BF12D2374ABF3C7943ACB436BA8CA641A103C2&key=ck2&ir=1&ms=nxu&mt=1405621414&mv=m&mws=yes,34|https://r3---sn-hp576nee.c.docs.google.com/videoplayback?requiressl=yes&shardbypass=yes&cmbypass=yes&id=857d340b237d4fb0&itag=34&source=webdrive&app=docs&ip=181.50.157.34&ipbits=0&expire=1405625079&sparams=requiressl,shardbypass,cmbypass,id,itag,source,ip,ipbits,expire&signature=7323C09E547F4F762382306FC2B54BCFCB76E366.9157689903CD8C1E39671160C80CA13D866BBCCF&key=ck2&ir=1&ms=nxu&mt=1405621414&mv=m&mws=yes","fmt_list":"18/640x360/9/0/115,34/640x360/9/0/115","url_encoded_fmt_stream_map":"itag=18&url=https://r3---sn-hp576nee.c.docs.google.com/videoplayback?requiressl=yes&shardbypass=yes&cmbypass=yes&id=857d340b237d4fb0&itag=18&source=webdrive&app=docs&ip=181.50.157.34&ipbits=0&expire=1405625079&sparams=requiressl,shardbypass,cmbypass,id,itag,source,ip,ipbits,expire&signature=49F5D7FC85FB145751263FEA498969631F1CE06B.A5BF12D2374ABF3C7943ACB436BA8CA641A103C2&key=ck2&ir=1&ms=nxu&mt=1405621414&mv=m&mws=yes&type=video/mp4;+codecs="avc1.42001E,+mp4a.40.2"&quality=medium,itag=34&url=https://r3---sn-hp576nee.c.docs.google.com/videoplayback?requiressl=yes&shardbypass=yes&cmbypass=yes&id=857d340b237d4fb0&itag=34&source=webdrive&app=docs&ip=181.50.157.34&ipbits=0&expire=1405625079&sparams=requiressl,shardbypass,cmbypass,id,itag,source,ip,ipbits,expire&signature=7323C09E547F4F762382306FC2B54BCFCB76E366.9157689903CD8C1E39671160C80CA13D866BBCCF&key=ck2&ir=1&ms=nxu&mt=1405621414&mv=m&mws=yes&type=video/x-flv&quality=medium","timestamp":"1405621479190","length_seconds":"3283"}},"webstoreui":{"mimeType":"video/x-msvideo","fileExtension":"avi","moreDriveAppsUrl":"https://chrome.google.com/webstore/category/collection/drive_apps"}});</script>
 

De ahí necesito sacar:

Código Javascript:

https://r3---sn-hp576nee.c.docs.google.com/videoplayback?requiressl=yes&shardbypass=yes&cmbypass=yes&id=857d340b237d4fb0&itag=18&source=webdrive&app=docs&ip=181.50.157.34&ipbits=0&expire=1405625079&sparams=requiressl,shardbypass,cmbypass,id,itag,source,ip,ipbits,expire&signature=49F5D7FC85FB145751263FEA498969631F1CE06B.A5BF12D2374ABF3C7943ACB436BA8CA641A103C2&key=ck2&ir=1&ms=nxu&mt=1405621414&mv=m&mws=yes
 

PAra después almacenarlo en alguna variable.

Todo esto desde php

Alguna idea?

[wilmer30]

Es Json busca por aqui: http://php.net/manual/es/book.json.php

[after]

Gracias. Ya he buscado y arreglado algo así:

Código PHP:

$json_string='{"status":"ok","hl":"e..etc";
 
$json=json_decode($json_string,true);
 
  foreach($json as $prop => $value)
 
 
echo  $json['fmt_stream_map'];
 

y funciona bien.

El problema ahora que tengo es que ese script está dentro de un HTML. Hay forma de decirle al foreach que capte solo el JSON? Ya que cuando le digo que tome la página me salta: Warning: Invalid argument supplied for foreach() lo cual me imagino es poque las primeras líneas son html