深入解析fsockopen与pfsockopen的区别

发布时间：2020-12-13 06:30:18 所属栏目：PHP教程来源：网络整理

导读：按手册上说,这两个函数的唯一区别是, pfsockopen 是持续连接,而 fsockopen 不是. 我写了个代码了一下: div class="codetitle" a style="CURSOR: pointer" data="85712" class="copybut" id="copybut85712" onclick="doCopy('code85712')" 代码如下: div clas

按手册上说,这两个函数的唯一区别是,

pfsockopen

是持续连接,而

fsockopen

不是.

我写了个代码了一下:

<div class="codetitle"><a style="CURSOR: pointer" data="85712" class="copybut" id="copybut85712" onclick="doCopy('code85712')"> 代码如下:<div class="codebody" id="code85712">
<?php
$data="1,721,73,1,43290000,60D81D509BC00451,3,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)."

";
}
$middleTime = microtime(true);
for ($index = 0; $index < $times; $index++) {
echo httpPost($host,!$pffirst)."

";;
}
$endTime = microtime(true);
echo ($pffirst?"pfsocket":"fsocket").":".($middleTime-$startTime);
echo "
";
echo ($pffirst?"fsocket":"pfsocket").":".($endTime-$middleTime);$count=0;
//发包函数
function httpPost($host,$p)
{
global $count;
$func = $p?"pfsockopen":"fsockopen";$conn = $func($host,80,$errno,$errstr,30);
if (!$conn)
{
echo "$errstr ($errno)
n";
return;
}$header = "POST ".$url." HTTP/1.1rn";
$header.= "Host : {$host}rn";
$header.= "Content-type: application/x-www-form-urlencodedrn";
$header.= "Content-Length:".strlen($data)."rn";
$header.= "Connection: Keep-Alivernrn";
$header.= "{$data}rnrn";fwrite($conn,$header);$count++;
echo $count.' '.$header."

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

<FONT style="COLOR: #ff0000">结果发现:

代码的倒数第二行,如果把//fclose($conn);注释掉,结果是:
fsocket:11.04693198204
pfsocket:0.34867787361145

<FONT style="COLOR: #ff0000">
如果不注释:

fsocket:12.509312152863
pfsocket:11.120275974274
可以看出,fsocketopen默认每次处理结束后,就算协议头是Keep-Alive,连接仍然断掉了.
而pfsocketopen在Keep-Alive条件下,连接可以被下一次重复利用.
一次连接发送大量数据时,推荐使用pfsocketopen

（编辑：李大同）