php 如何在无限循环中每 4 分钟回显一次
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How to echo something every 4 minutes while in an endless loop
提问by Matt Jenkins
I have a script that uses while(true)to run so it runs forever until it dies. I want to be able to make it echo something once every 4 minutes, how can i do this? The script runs on command prompt and it uses while(true)so its confusing plus i am not sure how to make it do that every 4 minutes.
How can i make it echo something once every 4 minutes while still in a while(true)?
我有一个while(true)用于运行的脚本，因此它会一直运行直到它死掉。我希望能够每 4 分钟回声一次，我该怎么做？该脚本在命令提示符下运行并使用它，while(true)因此它令人困惑，而且我不知道如何让它每 4 分钟执行一次。我怎样才能让它每 4 分钟回声一次，而仍然在 a 中while(true)？
回答by Baba
You can try
你可以试试
while(true)
{
sleep(240); // sleep for 240 sec
echo " Hello World" ;
}
Or
或者
$time = time();
while ( true ) {
/*
* Play Some Ball
*/
if ((time() - $time) >= 240) {
echo date("Y:m:d g:i:s"), PHP_EOL;
$time = time();
}
sleep(2);
}
Output Test with Time = 2 sec, Sleep = 1 sec
输出测试 Time = 2 sec, Sleep = 1 sec
2012:10:14 12:50:56
2012:10:14 12:50:58
2012:10:14 12:51:00
2012:10:14 12:51:02
2012:10:14 12:51:04
2012:10:14 12:51:06
2012:10:14 12:51:08
2012:10:14 12:51:10
2012:10:14 12:51:12
2012:10:14 12:51:14
回答by Lix
Using a sleepmethod will actually halt your script from running. I'm not 100% if this is what you want to happen.
使用sleep方法实际上会停止您的脚本运行。如果这是你想要发生的，我不是 100%。
Another way to attack this issue would be to compare timestamps from the last "echo" command on each iteration.
解决此问题的另一种方法是在每次迭代时比较最后一个“echo”命令的时间戳。
$echo_time = time();
$interval = 4*60;
while(true){
if ($echo_time + $interval >= time()){
echo "$interval seconds have passed...";
$echo_time = time(); // set up timestamp for next interval
}
// other uninterrupted code goes here.
}
This will allow your code within your loop to continue running and only check the times at the start of each iteration.
这将允许循环中的代码继续运行，并且只在每次迭代开始时检查时间。
回答by Marin Sagovac
Try adding in a loop of while(true) { ... }sleep() parameter function.
尝试添加while(true) { ... }sleep() 参数函数的循环。
$sleep = 4*60;
while(true)
{
# waiting...
sleep($sleep);
# work after 240 mins
}
