php执行URL解析

$url="http://www.baidu.com";
file_get_contents($url);

// CURL 方法
          $url="http://www.baidu.com";
          $ch = curl_init(  );
          curl_setopt( $ch,CURLOPT_URL,$url );
          curl_setopt( $ch,CURLOPT_HEADER,0 );
          curl_setopt( $ch,CURLOPT_RETURNTRANSFER,1 );
          $ret= curl_exec( $ch );
          curl_close( $ch );
          echo $ret;

$url="http://www.baidu.com";
    $fp=fopen($url,"r");
    $response = '';
            while($row = fgets($fp)) {
                $response.= trim($row)."\n";
            }