php 检测用户是否关闭浏览器

1、例子1

 echo str_repeat(" ",3000);ignore_user_abort(true); mylog('online');while (true) {/** 1、程序正常结束     connection_status 0* 2、点击浏览器“停止”按钮     connection_status 1* 3、超时    connection_status 2*/echo "test<br>\n"; //注意程序一定要有输出，否则ABORTED状态是检测不到的flush();sleep(1);if (connection_status()!=0){mylog('offline');die('end the script');}}function mylog($str){$fp = fopen('e:/abort.txt', 'a');$str = date('Y-m-d H:i:s').$str."\r\n";fwrite($fp, $str);fclose($fp);}

2.例子2

function foo() {$s = 'connection_status '. connection_status();mylog($s);
} 
register_shutdown_function('foo');//script processing is complete or when exit() is called
set_time_limit(10);
for($i=0; $i<10000000; $i++)echo $i;function mylog($str)
{$fp = fopen('e:/abort.txt', 'a');$str = date('Y-m-d H:i:s').$str."\r\n";fwrite($fp, $str);fclose($fp);
}