youtube視頻信息json對象給出錯誤

Question

我正在使用youtube api 我想使用youtube視頻信息獲取youtube視頻信息JSON對象 我正在使用下面給出的代碼，但是當我嘗試運行此代碼時被顯示爲「視頻不是密碼不需要解碼」 請幫我解決它也告訴我，是被設置爲false，因爲在代碼

<?php 
// Video with cipher signature 
$video_id = "zDrNLZ1uJ2w"; 
// get_video_info url formation 
// although for cipher signature we have to get the details from the video's webapge not from get_video_info object 
$info_url = "http://www.youtube.com/get_video_info?el=detailpage&asv=3&video_id=".$video_id; 

// youtube webpage url formation 
$yt_url = 'http://www.youtube.com/watch?v='.$video_id.'&gl=US&persist_gl=1&hl=en&persist_hl=1';; 
// get the contents from the url 
$raw_data = file_get_contents($info_url); 

// parse the data received and save it as an array 
$output = array(); 
parse_str($raw_data,$output); 
// check the status of the get_video_info object 
if($output['status']=='ok'){ 

    // check for the cipher signature 
    $cipher = (isset($output['use_cipher_signature']) && $output['use_cipher_signature']=='True') ? true : false; 
    // If cipher is true then we have to decode it 
    if($cipher == true){ 

     // if cipher is true then we have to change the plan and get the details from the video's youtube wbe page 
     $yt_html = file_get_contents($yt_url); 

     // parse for the script containing the configuration 
     preg_match('/ytplayer.config = {(.*?)};/',$yt_html,$match); 
     $yt_object = @json_decode('{'.$match[1].'}') ; 
     /// check if we are able to parse data 
     if(!is_object($yt_object)){ 
      echo 'Sorry! Unable to parse Data'; 
     }else{ 

      // parse available formats 
      $formats = $yt_object->args->url_encoded_fmt_stream_map; 
      // get the player id from assets section 
      $player_id = strbtwn($yt_object->assets->js,'html5player-','.js'); 
      $player_id = explode("/", $player_id); 
      $player_id = $player_id[0]; 

      echo 'Player ID: '.$player_id.'<br /><hr />'; 

      // get the algo dictionary 
      // first check if the file exists 
      if(file_exists('./algo.json')) 
       $algos = json_decode(file_get_contents('algo.json'),true); 
      else{ 
       // API call to fetch the algo dictionary 
       $algos_dict = file_get_contents("http://api.gitnol.com/getAlgo.php?playerID=".$player_id); 

       // saving the algo dictonary in local env for easy access 
       // Note: Developers should save the dictionary in their local env. 
       // Only make the API call for the new player ids which is not present in the algo dictionary. 
       // Repeated violation will results in IP ban. 
       file_put_contents('algo.json', $algos_dict); 

       $algos = json_decode($algos_dict,true); 
      } 
      /// check if the algo exist for the given player id 
      if(!array_key_exists($player_id, $algos)){ 

       // if the algo dictionary is old then fetch a new one 
       $algos_dict = file_get_contents("http://api.gitnol.com/getAlgo.php?playerID=".$player_id); 
       file_put_contents('algo.json', $algos_dict); 

       $algos = json_decode($algos_dict,true); 
       $algo = $algos[$player_id][1]; 

      }else{ 
       $algo = $algos[$player_id][1]; 
      } 

      echo 'Algo Used: '.$algo.'<br /><hr />'; 

      // download links formation 
      $dlinks = array(); 
      $links = explode(',',$formats); 

      echo 'Download links <br /><br />'; 

      foreach ($links as $link) { 
       parse_str($link,$linkarr); 

       // parse link array one by one and decrypt the signature 
       $dlinks[$linkarr['itag']] = $linkarr['url'] . "&signature=" . decrypt($linkarr['s'],$algo); 
       echo $linkarr['itag'].'<br />'; 
       echo $dlinks[$linkarr['itag']].'<br /><br />'; 
      } 
      echo '<hr />'; 
     } 
    }else{ 
     echo 'Video Is not cipher not needed to decode'; 
    } 
}else{ 
    echo 'Unable to get Video Info'; 
} 

// string helper function 
function strbtwn($content,$start,$end){ 
    $r = explode($start, $content); 
    if (isset($r[1])){ 
     $r = explode($end, $r[1]); 
     return $r[0]; 
    } 
    return ''; 
} 

// signature decoding 
// parse the python string operation into php string operation 
function decrypt($sig, $algo){   
    $funcarr = explode(' + ', $algo); 
    $decrypt = ''; 
    foreach($funcarr as $singfunc){ 
     $singfunc = substr($singfunc,2,-1); 
     $operators = explode(':', $singfunc); 
     if (sizeof($operators) == 1) { 
      $decrypt .= $sig[$operators[0]]; 
     } 
     if (sizeof($operators) == 2) { 
      if($operators[0] == ''){ 
       $decrypt .= substr($sig, 0 ,$operators[1]); 
      } 
      if($operators[1] == ''){ 
       $decrypt .= substr($sig, $operators[0]); 
      } 
      if($operators[0] >= 0 && $operators[1] >= 0){ 
       $decrypt .= substr($sig, $operators[0], $operators[1] - $operators[0]); 
      } 
     } 
     if (sizeof($operators) == 3) { 
      if($operators[0] == '' && $operators[1] == ''){ 
       $decrypt .= strrev($sig); 
      } 
      if($operators[0] >=0 && $operators[1] == '' && $operators[0] != ''){ 
       $decrypt .= strrev(substr($sig, 0, $operators[0] + 1)); 
      } 
      if($operators[0] >=0 && $operators[1] >= 0 && $operators[0] != '' && $operators[1] != ''){ 
       $decrypt .= strrev(substr($sig, $operators[1] + 1, $operators[0] - $operators[1])); 
      } 
     } 
    } 
    return $decrypt; 
} 
?> 

Answer 1

問題根據你的代碼$密碼錯誤在file_get_contents（$ info_url）的$ raw_data中找不到'use_cipher_signature'。