curl No Match in YouTube -- returns null - php

Question

But another server returns content normally..
$URL = http://www.youtube.com/get_video_info?&video_id='.$this->VideoId.'&asv=3&el=detailpage&hl=en_US
function curlGet($URL) {
$ch = curl_init();
curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows NT 6.1; rv:19.0) Gecko/20100101 Firefox/19.0');
curl_setopt($ch, CURLOPT_URL, $URL);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_TIMEOUT, 5);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5);
$contents = curl_exec($ch);
if(curl_errno($ch)) {
echo ' er: ' . curl_error($ch) ;
}
// get content
echo $contents ;
curl_close($ch);
}

Answer 1

Set the options to see the Request and Response headers.
It is a good idea to include CURLOPT_FOLLOWLOCATION if your url is redirected.
Something like this will help find problems.
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_HEADER, true);
curl_setopt($ch, CURLINFO_HEADER_OUT, true);
curl_setopt($ch, CURLOPT_VERBOSE, true);
curl_setopt($ch, CURLOPT_FAILONERROR,true);
curl_setopt($ch, CURLOPT_AUTOREFERER, true);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_ENCODING,"");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_FILETIME, true);
curl_setopt($ch, CURLOPT_USERAGENT,"Mozilla/5.0 (Windows NT 5.1; rv:32.0) Gecko/20100101 Firefox/32.0");
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 100);
curl_setopt($ch, CURLOPT_TIMEOUT,100);
$data = curl_exec($ch);
if (curl_errno($ch)){
$data .= 'Retreive Base Page Error: ' . curl_error($ch);
}
else {
$skip = intval(curl_getinfo($ch, CURLINFO_HEADER_SIZE));
$responseHeader = substr($data,0,$skip);
$data= substr($data,$skip);
$info = curl_getinfo($ch);
$info = var_export($info,true);
}
echo $responseHeader;
echo $info;
print_r($data);