php中file_get_contents与curl性能比较分析

$config['context'] = stream_context_create(array('http' => array('method' => "GET",
   'timeout' => 5//这个超时时间不稳定，经常不奏效
   )
));

function curl_file_get_contents($durl){
  $ch = curl_init();
  curl_setopt($ch, CURLOPT_URL, $durl);
  curl_setopt($ch, CURLOPT_TIMEOUT, 5);
  curl_setopt($ch, CURLOPT_USERAGENT, _USERAGENT_);
  curl_setopt($ch, CURLOPT_REFERER,_REFERER_);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
  $r = curl_exec($ch);
  curl_close($ch);
   return $r;
}

<?php
/**
 
* 通过淘宝IP接口获取IP地理位置
 
* @param string $ip
 
* @return: string
 
**/
function getCityCurl($ip)
{
    $url="http://ip.taobao.com/service/getIpInfo.php?ip=".$ip; 
    $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);
 
    $ipinfo=json_decode($file_contents);
    if($ipinfo->code=='1'){
        return false;
    }
    $city = $ipinfo->data->region.$ipinfo->data->city;
    return $city;
}
 
function getCity($ip)
{ 
    $url="http://ip.taobao.com/service/getIpInfo.php?ip=".$ip; 
    $ipinfo=json_decode(file_get_contents($url));
    if($ipinfo->code=='1'){
        return false;
    }
    $city = $ipinfo->data->region.$ipinfo->data->city;
    return $city;
}
 
// for file_get_contents
$startTime=explode(' ',microtime());
$startTime=$startTime[0] + $startTime[1];
for($i=1;$i<=10;$i++)
{
   echo getCity("121.207.247.202")."</br>";
}
$endTime = explode(' ',microtime());
$endTime = $endTime[0] + $endTime[1];
$totalTime = $endTime - $startTime;
echo 'file_get_contents:'.number_format($totalTime, 10, '.', "")." seconds</br>";
 
//for curl
$startTime2=explode(' ',microtime());
$startTime2=$startTime2[0] + $startTime2[1];
for($i=1;$i<=10;$i++)
{
   echo getCityCurl('121.207.247.202')."</br>";
}
$endTime2 = explode(' ',microtime());
$endTime2=$endTime2[0] + $endTime2[1];
$totalTime2 = $endTime2 - $startTime2;
echo "curl:".number_format($totalTime2, 10, '.', "")." seconds";
?>