php调用远路url的四种方法

$html = file_get_contents($url); 

$fp = fopen($url, 'r');
 $html = stream_get_meta_data($fp); 

 $data = array ('test' => 'hellword');
 $data = http_build_query($data);
 $opts = array (
  'http' => array (
  'method' => 'POST',
  'header'=> "Content-type: application/x-www-form-urlencoded\r\n" .
	     "Content-Length: " . strlen($data) . "\r\n",
  'content' => $data
  ),
 );
 $context = stream_context_create($opts);
 $html = file_get_contents($url, false, $context);

$ch = curl_init();
 $timeout = 5;
 curl_setopt ($ch, CURLOPT_URL, $url);
 curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
 curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
 $file_contents = curl_exec($ch);
 curl_close($ch);
 echo $file_contents;