深入解析fsockopen與pfsockopen的區別

按手冊上說,這兩個函數的唯一區別是,pfsockopen是持續連接,而fsockopen不是.
我寫了個代碼了一下:
復制代碼 代碼如下:
<?php
$data="1,0,721,73,1,0,0,43290000,0,60D81D509BC00451,3,FFFFFFFF";
//http://10.144.99.114/SANEX_NEW/modules/subscribemanager/test.php
$host = '127.0.0.1';
$url = "/aa.php";
$pffirst = false;
$times = 1000;
$startTime = microtime(true);
for ($index = 0; $index < $times; $index++) {
 echo httpPost($host,$url,$data,$pffirst)."<hr><br />";
}
$middleTime = microtime(true);
for ($index = 0; $index < $times; $index++) {
 echo httpPost($host,$url,$data,!$pffirst)."<hr><br />";;
}
$endTime = microtime(true);
 echo ($pffirst?"pfsocket":"fsocket").":".($middleTime-$startTime);
 echo "<br />";
 echo ($pffirst?"fsocket":"pfsocket").":".($endTime-$middleTime);

$count=0;
//發包函數
function httpPost($host,$url,$data,$p)
{
global $count;
 $func = $p?"pfsockopen":"fsockopen";

 $conn = $func($host,80,$errno, $errstr, 30);
 if (!$conn)
 {
  echo "$errstr ($errno)<br />\n";
  return;
 }

 $header = "POST ".$url." HTTP/1.1\r\n";
 $header.= "Host : {$host}\r\n";
 $header.= "Content-type: application/x-www-form-urlencoded\r\n";
 $header.= "Content-Length:".strlen($data)."\r\n";
 $header.= "Connection: Keep-Alive\r\n\r\n"; 
 $header.= "{$data}\r\n\r\n";

 fwrite($conn,$header);

 $count++;
 echo $count.' '.$header."<br /><br />";

 $resp='';
 //while (!feof($conn)) {
 // $resp .= fgets($conn);
 //}
 //fclose($conn);
 return $resp;
}
?>

結果發現:
代碼的倒數第二行,如果把//fclose($conn);注釋掉,結果是:
fsocket:11.04693198204
pfsocket:0.34867787361145

如果不注釋:
fsocket:12.509312152863
pfsocket:11.120275974274
可以看出,fsocketopen默認每次處理結束後,就算協議頭是Keep-Alive,連接仍然斷掉了.
而pfsocketopen在Keep-Alive條件下,連接可以被下一次重復利用.
一次連接發送大量數據時,推薦使用pfsocketopen