fsockopen,读返回数据不易采用feof函数

fsockopen,读返回数据不易采用feof函数
两天辛苦，得出一个结论：用feof函数判断读socket返回是否结束，是非常错误的做法。效率之低，耗时之久，实在让人忍无可忍。
写一断测试代码：

<?php 
function httpPost($host,$url,$data,$p)
{
	$conn = fsockopen($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);
	
	
	//读内容
	$resp='';
	$start = microtime(true);
	echo "开始读<br>";
	while (!feof($conn)) {
		echo "读之前：".(microtime(true)-$start)."<br>";
		$resp .= fread($conn,64);
		echo "读之后：".(microtime(true)-$start)."<br>";
	}
	echo "内容：".$resp."<br>";
	echo "读完关闭前：".(microtime(true)-$start)."<br>";
	fclose($conn);
	echo "关闭：".(microtime(true)-$start)."<br>";
	return $resp;
}

httpPost("127.0.0.1","/aa.php","test",true);
?>

输出结果：

开始读
读之前：4.4822692871094E-5
读之后：0.00069689750671387
读之前：0.00070381164550781
读之后：0.00070691108703613
读之前：0.00070881843566895
读之后：0.00071382522583008
读之前：0.00071597099304199
读之后：5.531320810318
内容：HTTP/1.1 200 OK Date: Sat, 28 Aug 2010 03:35:20 GMT Server: Apache/2.2.15 (Win32) PHP/5.2.12 X-Powered-By: PHP/5.2.12 Content-Length: 5 Keep-Alive: timeout=5, max=100 Connection: Keep-Alive Content-Type: text/html hello
读完关闭前：5.5313439369202
关闭：5.531445980072

可以看到，读最后一条数据时，耗时达5秒之多。
另一种方法,见续篇http://baiyuxiong.iteye.com/admin/blogs/758754