怎样判断用户已经掉线,关闭网页

仔细研究了

connection_status 和 connection_aborted

了解清楚他们的用法:

<?
echo str_repeat(" ",300);
ignore_user_abort(true); //没有这个一旦用户断线,php(线程)就会立即终止!没有机会执行" if connection_status()!=0||connection_aborted){"了

while (true) {

echo "test<br>/n;//必须有输出, 否则线程会一直执行下去,直到你重新启动apche(2小时以上,我只测了那么久),输出也可以写道 //注释2处

flush();

if (connection_status()!=0||connection_aborted()){
//用户退出了

}

//注释2

sleep(2);
}
?>

本来想给php手册加个注释的,无奈,始终加不上,他那个验证问题,我试了用数字和大小写英文回答,始终都没有对,郁闷死我了!

<?
echo str_repeat(" ",300);
ignore_user_abort(true); //without this, current apache thread will terminate Immediately,so the code "if (connection_status()!=0){" will not be executed as the script was broken off!
while (true) {
echo "test<br>/n";//if there's no any output, this script will execute endless, which means the current apache thread will not end until you restart apache and connection_status()will keep 0 and connection_aborted() will keep false.
flush();
sleep(2);
if (connection_status()!=0){
include ('dbconnect.inc');
$sql="delete from online_users where online_user=$user";
$sql_exec=pg_exec($vChatDB, $sql);
die(); //kills the script
}
}
?>