要实现判断用户已掉线并关闭网页，主要用到方法connection_status 和 connection_aborted。
通过一个例子，来了解下它们的用法:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | <?echo str_repeat(" ",300);//以下不可省略，否则用户断线，php(线程)立即终止，不会执行" if connection_status()!=0||connection_aborted){"ignore_user_abort(true); while (true) { echo "test<br>/n;//必须有输出, 否则线程会一直执行下去，直到重新启动apche(测试过程2小时)，输出也可以写到//注释2处 flush(); if (connection_status()!=0||connection_aborted()){ //用户退出了 } //注释2 sleep(2);//by www.jb200.com}?> |
下面是另一个例子：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | <?//检测是否掉线，然后关闭网页//编辑：www.jb200.comecho str_repeat(" ",300);ignore_user_abort(true); //without this, current <a href="http://www.jb200.com/apache/" target="_blank" class="infotextkey">apache</a> 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){ <a href="http://www.jb200.com/zt/include/" target="_blank" class="infotextkey">include</a> ('dbconnect.inc'); $sql="delete from online_users where online_user=$user"; $sql_exec=pg_exec($vChatDB, $sql); die(); //kills the script }}?> |