某一段时间内没有新的内容向浏览器输入，可能发生连接超时现象。什么办法解决呢？可以在执行页面中加个向浏览器发送一个空信号，类似ftp连接方式，上面页面中在do...while(1)间加个print("");

以上是转的部分,由于比较有兴趣,在GOOGLE上找了一下,大家可以看看下面的资料.

Requirements
Works with Apache-1.3.14/PHP4.0.3pl1 server and Various Netscape clients. Probably many other server combos. Tested on Netscape 4.7x and 6.0/Mozilla.
Does NOT WORK WITH IE. Internet Exploiter does not support x-mixed-replace server-push as far as I know. If a browser has "MSIE" in its User-Agent string the script will display one image and exit.

Update 20020108: Poked around freshmeat for a bit and found Andy Wilcock's Cambozola java applet which seems to work well with my php script to make the stream viewable under IE. Beware that the current version doesn't work under "Name-based" virtual hosts but I'll have a patch for it soon.
Source
Download

<?
＄file = "./latest.jpg";
＄sep = "gIrLsKiCkAsSiTsAySsOoNaTsHiRt";

if (ereg(".*MSIE.*",＄HTTP_SERVER_VARS["HTTP_USER_AGENT"]))
{
# If IE, spit out one pic and exit
header("Cache-Control: no-cache");
header("Pragma: no-cache");
header("Content-type: image/jpeg");
header("Content-size: " . filesize(＄file));
readfile(＄file);
}
else
{
# if not IE, give the browser a try
header("Content-Type: multipart/x-mixed-replace; boundary=＄sep");
print "--＄sep\n";
do {
print "Content-Type: image/jpeg\n\n";
readfile(＄file);
print "\n--＄sep\n";
flush();
＄mt = filemtime(＄file);
do {
sleep (1);
# we won't output the same image twice.
clearstatcache();
} while (＄mt == filemtime(＄file));

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