fsockopen与pfsockopen的区别

按手册上说,这两个函数的唯一区别是,pfsockopen是是持续连接,而fsockopen不是.
我写了个代码了一下:

<?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;

//发包函数
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;
}

?>

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
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