youtube api - loop throug huge data - youtube-api

Question

I need to retrieve the 'view count' for each video channel , and I’m using this library .
this is my code
okay the code works fine and print me the view count foreach video , except that i got these warnings with some other videos without printing the view count
A PHP Error was encountered Severity: Warning Message:
simplexml_load_string() [function.simplexml-load-string]: Entity:
line 547: parser error : attributes construct error
Message:
simplexml_load_string() [function.simplexml-load-string]:
outube_gdata'/>
Message:
simplexml_load_string() [function.simplexml-load-string]: ^
Message:
simplexml_load_string() [function.simplexml-load-string]: Entity:
line 547: parser error : Couldn't find end of Start Tag link line 547
Message: simplexml_load_string() [function.simplexml-load-string]:
outube_gdata'/>
how can i deal with this large number of videos and channels without causing this warning msgs and lost in time , cause if i tried the same code on one channel with fewer videos i got no errors
$channels=array('google','apple','mac','xyz','abc','test');
for ($j=0; $j<count($channels) $j++)
{
$JSON = file_get_contents("https://gdata.youtube.com/feeds/api/users/".$channels[$j]."/uploads?v=2&alt=jsonc&max-results=0");
$JSON_Data = json_decode($JSON);
$total_videos = $JSON_Data->{'data'}->{'totalItems'};
for($i=1; $i<=$total_videos; )
{
$this->get_userfeed($channels[$j],$maxresult=20,$start=$i);
$i+=20;
}
}
public function get_userfeed($ch_id,$maxresult=10,$start=0,$do=null)
{
$output = $this->youtube->getUserUploads($ch_id, array('max-results'=>$maxresult,'start-index'=>$start));
$xml = simplexml_load_string($output);
// single entry for testing
foreach($xml->entry as $entry)
{
foreach($entry->id as $key=>$val)
{
$id = explode('videos/', (string)$val);
$JSON = file_get_contents("https://gdata.youtube.com/feeds/api/videos/".$id[1]."?v=2&alt=json");
$JSON_Data = json_decode($JSON);
$v_count = $JSON_Data->{'entry'}->{'yt$statistics'}->{'viewCount'};
if($v_count == NULL) $v_count =0;
echo $v_count;
// store the v_count into database
}
}
}

Answer 1

You're doing a few things wrong.
First off, if you want to minimize the number of calls you're making to the API, you should be setting max-results=50, which is the largest value that the API supports.
Second, I don't understand why you're making individual calls to http://.../videos/VIDEO_ID to retrieve the statistics for each video, since that information is already returned as part of the video entries you're getting from the http://.../users/USER_ID/uploads feed. You can just store the values returned by that feed and avoid having to make all those additional calls to retrieve each video.
Finally, the underlying issue is almost certainly that you're running into quota errors, and you can read more about them at http://apiblog.youtube.com/2010/02/best-practices-for-avoiding-quota.html
Taking any of the steps I mention should cut down on the total requests that you're making and potentially get around any quota problems, but you should familiarize yourself with the quota system anyway.