Array doida, que não entendo.

Galera, eu tenho um script que gera a seguinte array:

 Array ( [0] => Array ( [ext] => 3gp [type] => Medium Quality - 176x144 => ://r2---sn-cg51pauxax-jfce.c.youtube.com/videoplayback?key=yt1&ip=189.10.123.195&upn=4CqhQ_W-3Ns&algorithm=throttle-factor&mv=m&sparams=algorithm%2Cburst%2Ccp%2Cfactor%2Cid%2Cip%2Cipbits%2Citag%2Csource%2Cupn%2Cexpire&source=youtube&id=a6e664a985ba27a8&factor=1.25&ipbits=8&itag=17&expire=1376939671&ms=au&burst=40&fexp=913427%2C923002%2C916612%2C932304%2C909546%2C906397%2C929117%2C929121%2C929906%2C929907%2C929922%2C929127%2C929129%2C929131%2C929930%2C925720%2C925722%2C925718%2C925714%2C929917%2C929919%2C929933%2C912521%2C932306%2C904830%2C919373%2C930803%2C904122%2C938701%2C911423%2C909549%2C900816%2C912711%2C935802%2C904494%2C906001&sver=3&cp=U0hWS1lOV19MS0NONl9RSEFHOmdGRkNKT2oxVVYz&mt=1376916912&signature=D8E7B5F247CA9F763BB4E0B2F8DE13BDE312A5B9.56744A69EB72E1D8C3E0D0FC8B3C8961AE290853 ) [1] => Array ( [ext] => 3gp [type] => High Quality - 320x240 => ://r2---sn-cg51pauxax-jfce.c.youtube.com/videoplayback?key=yt1&ip=189.10.123.195&upn=4CqhQ_W-3Ns&algorithm=throttle-factor&mv=m&sparams=algorithm%2Cburst%2Ccp%2Cfactor%2Cid%2Cip%2Cipbits%2Citag%2Csource%2Cupn%2Cexpire&source=youtube&id=a6e664a985ba27a8&factor=1.25&ipbits=8&itag=36&expire=1376939671&ms=au&burst=40&fexp=913427%2C923002%2C916612%2C932304%2C909546%2C906397%2C929117%2C929121%2C929906%2C929907%2C929922%2C929127%2C929129%2C929131%2C929930%2C925720%2C925722%2C925718%2C925714%2C929917%2C929919%2C929933%2C912521%2C932306%2C904830%2C919373%2C930803%2C904122%2C938701%2C911423%2C909549%2C900816%2C912711%2C935802%2C904494%2C906001&sver=3&cp=U0hWS1lOV19MS0NONl9RSEFHOmdGRkNKT2oxVVYz&mt=1376916912&signature=372DD13E7EC379D683532BF618736A35DE413E4F.805FE6294D584C256305F41DE449CEE5B7AC46B0 ) [2] => Array ( [ext] => flv [type] => Low Quality - 400x226 => ://r2---sn-cg51pauxax-jfce.c.youtube.com/videoplayback?key=yt1&ip=189.10.123.195&upn=4CqhQ_W-3Ns&algorithm=throttle-factor&mv=m&sparams=algorithm%2Cburst%2Ccp%2Cfactor%2Cid%2Cip%2Cipbits%2Citag%2Csource%2Cupn%2Cexpire&source=youtube&id=a6e664a985ba27a8&factor=1.25&ipbits=8&itag=5&expire=1376939671&ms=au&burst=40&fexp=913427%2C923002%2C916612%2C932304%2C909546%2C906397%2C929117%2C929121%2C929906%2C929907%2C929922%2C929127%2C929129%2C929131%2C929930%2C925720%2C925722%2C925718%2C925714%2C929917%2C929919%2C929933%2C912521%2C932306%2C904830%2C919373%2C930803%2C904122%2C938701%2C911423%2C909549%2C900816%2C912711%2C935802%2C904494%2C906001&sver=3&cp=U0hWS1lOV19MS0NONl9RSEFHOmdGRkNKT2oxVVYz&mt=1376916912&signature=75C2223AE6F3C8A020025A46CE4CF1D4D465DCF9.52A9D26210A9CF3FA83E252D72FAD82B80E0825E ) [3] => Array ( [ext] => flv [type] => Medium Quality - 640x360 => ://r2---sn-cg51pauxax-jfce.c.youtube.com/videoplayback?key=yt1&ip=189.10.123.195&upn=4CqhQ_W-3Ns&algorithm=throttle-factor&mv=m&sparams=algorithm%2Cburst%2Ccp%2Cfactor%2Cid%2Cip%2Cipbits%2Citag%2Csource%2Cupn%2Cexpire&source=youtube&id=a6e664a985ba27a8&factor=1.25&ipbits=8&itag=34&expire=1376939671&ms=au&burst=40&fexp=913427%2C923002%2C916612%2C932304%2C909546%2C906397%2C929117%2C929121%2C929906%2C929907%2C929922%2C929127%2C929129%2C929131%2C929930%2C925720%2C925722%2C925718%2C925714%2C929917%2C929919%2C929933%2C912521%2C932306%2C904830%2C919373%2C930803%2C904122%2C938701%2C911423%2C909549%2C900816%2C912711%2C935802%2C904494%2C906001&sver=3&cp=U0hWS1lOV19MS0NONl9RSEFHOmdGRkNKT2oxVVYz&mt=1376916912&signature=8F61FFB2D3679BC3F5FBE58EB58E3A92E2EE5861.8EE537B8F2FA453A1F0DBC087BE79C024BFC0B65 ) [4] => Array ( [ext] => flv [type] => High Quality - 854x480 => ://r2---sn-cg51pauxax-jfce.c.youtube.com/videoplayback?key=yt1&ip=189.10.123.195&upn=4CqhQ_W-3Ns&algorithm=throttle-factor&mv=m&sparams=algorithm%2Cburst%2Ccp%2Cfactor%2Cid%2Cip%2Cipbits%2Citag%2Csource%2Cupn%2Cexpire&source=youtube&id=a6e664a985ba27a8&factor=1.25&ipbits=8&itag=35&expire=1376939671&ms=au&burst=40&fexp=913427%2C923002%2C916612%2C932304%2C909546%2C906397%2C929117%2C929121%2C929906%2C929907%2C929922%2C929127%2C929129%2C929131%2C929930%2C925720%2C925722%2C925718%2C925714%2C929917%2C929919%2C929933%2C912521%2C932306%2C904830%2C919373%2C930803%2C904122%2C938701%2C911423%2C909549%2C900816%2C912711%2C935802%2C904494%2C906001&sver=3&cp=U0hWS1lOV19MS0NONl9RSEFHOmdGRkNKT2oxVVYz&mt=1376916912&signature=6213E835C20DFD87883FA4A5C894D450E743DA7D.84D90B8EFE98A3E985CE414BD704567E26016399 ) [5] => Array ( [ext] => webm [type] => Low Quality - 640x360 => ://r2---sn-cg51pauxax-jfce.c.youtube.com/videoplayback?key=yt1&ip=189.10.123.195&upn=4CqhQ_W-3Ns&mv=m&sparams=cp%2Cid%2Cip%2Cipbits%2Citag%2Cratebypass%2Csource%2Cupn%2Cexpire&source=youtube&ratebypass=yes&ipbits=8&itag=43&expire=1376939671&ms=au&id=a6e664a985ba27a8&fexp=913427%2C923002%2C916612%2C932304%2C909546%2C906397%2C929117%2C929121%2C929906%2C929907%2C929922%2C929127%2C929129%2C929131%2C929930%2C925720%2C925722%2C925718%2C925714%2C929917%2C929919%2C929933%2C912521%2C932306%2C904830%2C919373%2C930803%2C904122%2C938701%2C911423%2C909549%2C900816%2C912711%2C935802%2C904494%2C906001&sver=3&cp=U0hWS1lOV19MS0NONl9RSEFHOmdGRkNKT2oxVVYz&mt=1376916912&signature=AB1AC6A53531E41E1E977C50009C54EC3D5C02EF.487F9ADD62EB4A557D606B9F6D1609805678EC91 ) [6] => Array ( [ext] => webm [type] => Medium Quality - 854x480 => ://r2---sn-cg51pauxax-jfce.c.youtube.com/videoplayback?key=yt1&ip=189.10.123.195&upn=4CqhQ_W-3Ns&mv=m&sparams=cp%2Cid%2Cip%2Cipbits%2Citag%2Cratebypass%2Csource%2Cupn%2Cexpire&source=youtube&ratebypass=yes&ipbits=8&itag=44&expire=1376939671&ms=au&id=a6e664a985ba27a8&fexp=913427%2C923002%2C916612%2C932304%2C909546%2C906397%2C929117%2C929121%2C929906%2C929907%2C929922%2C929127%2C929129%2C929131%2C929930%2C925720%2C925722%2C925718%2C925714%2C929917%2C929919%2C929933%2C912521%2C932306%2C904830%2C919373%2C930803%2C904122%2C938701%2C911423%2C909549%2C900816%2C912711%2C935802%2C904494%2C906001&sver=3&cp=U0hWS1lOV19MS0NONl9RSEFHOmdGRkNKT2oxVVYz&mt=1376916912&signature=99BFDBE2A670E257A677F01A16C309F9CDA80BFE.AE83965E159D02B4B7350D0AD642B40463A5B107 ) [7] => Array ( [ext] => webm [type] => High Quality - 1280x720 => ://r2---sn-cg51pauxax-jfce.c.youtube.com/videoplayback?key=yt1&ip=189.10.123.195&upn=4CqhQ_W-3Ns&mv=m&sparams=cp%2Cid%2Cip%2Cipbits%2Citag%2Cratebypass%2Csource%2Cupn%2Cexpire&source=youtube&ratebypass=yes&ipbits=8&itag=45&expire=1376939671&ms=au&id=a6e664a985ba27a8&fexp=913427%2C923002%2C916612%2C932304%2C909546%2C906397%2C929117%2C929121%2C929906%2C929907%2C929922%2C929127%2C929129%2C929131%2C929930%2C925720%2C925722%2C925718%2C925714%2C929917%2C929919%2C929933%2C912521%2C932306%2C904830%2C919373%2C930803%2C904122%2C938701%2C911423%2C909549%2C900816%2C912711%2C935802%2C904494%2C906001&sver=3&cp=U0hWS1lOV19MS0NONl9RSEFHOmdGRkNKT2oxVVYz&mt=1376916912&signature=9488F49055D62AA1BB16BC2B4216D5B9C31212E1.6B3AFBFEA269CA0048135A41D0A460CA80DA72E7 ) [8] => Array ( [ext] => mp4 [type] => Medium Quality - 480x360 => ://r2---sn-cg51pauxax-jfce.c.youtube.com/videoplayback?key=yt1&ip=189.10.123.195&upn=4CqhQ_W-3Ns&mv=m&sparams=cp%2Cid%2Cip%2Cipbits%2Citag%2Cratebypass%2Csource%2Cupn%2Cexpire&source=youtube&ratebypass=yes&ipbits=8&itag=18&expire=1376939671&ms=au&id=a6e664a985ba27a8&fexp=913427%2C923002%2C916612%2C932304%2C909546%2C906397%2C929117%2C929121%2C929906%2C929907%2C929922%2C929127%2C929129%2C929131%2C929930%2C925720%2C925722%2C925718%2C925714%2C929917%2C929919%2C929933%2C912521%2C932306%2C904830%2C919373%2C930803%2C904122%2C938701%2C911423%2C909549%2C900816%2C912711%2C935802%2C904494%2C906001&sver=3&cp=U0hWS1lOV19MS0NONl9RSEFHOmdGRkNKT2oxVVYz&mt=1376916912&signature=C88F8AD519C69D2DEC0940E301F520C09113E1D5.96F521E6AAEB07E37D76618834404CDF9AE8DC62 ) **[9] => Array** **(** **[ext] => mp4** **[type] => High Quality - 1280x720** ** => ://r2---sn-cg51pauxax-jfce.c.youtube.com/videoplayback?key=yt1&ip=189.10.123.195&upn=4CqhQ_W-3Ns&mv=m&sparams=cp%2Cid%2Cip%2Cipbits%2Citag%2Cratebypass%2Csource%2Cupn%2Cexpire&source=youtube&ratebypass=yes&ipbits=8&itag=22&expire=1376939671&ms=au&id=a6e664a985ba27a8&fexp=913427%2C923002%2C916612%2C932304%2C909546%2C906397%2C929117%2C929121%2C929906%2C929907%2C929922%2C929127%2C929129%2C929131%2C929930%2C925720%2C925722%2C925718%2C925714%2C929917%2C929919%2C929933%2C912521%2C932306%2C904830%2C919373%2C930803%2C904122%2C938701%2C911423%2C909549%2C900816%2C912711%2C935802%2C904494%2C906001&sver=3&cp=U0hWS1lOV19MS0NONl9RSEFHOmdGRkNKT2oxVVYz&mt=1376916912&signature=CDBA054F2E99E2B9EA4F87118E114014A6DB9479.550F5A0A25287983170B7AED81A4C64F456DED8C** **)** )

  

 mas eu quero pegar a URL da que ta em negrito, e não sei como, como faço?