PHP gets the timestamp php timing task for a period of time

In these two days, the following functions will be implemented:

When a certain 1 condition is reached, let the server send a message to the user, the number is multiple.

Basic idea: linux regularly scans and sends SMS messages to users who meet the requirements.

However, in order to avoid disturbing users, it is required to send SMS messages only between 8:00 and 20:00 during the day. How can I get to this time of day?

Please have a look at

 
$y=date("Y",time()); 
$m=date("m",time()); 
$d=date("d",time()); 
$start_time = mktime(9, 0, 0, $m, $d ,$y); 
$end_time = mktime(19, 0, 0, $m, $d ,$y); 

$time = time(); 
if($time >= $start_time && $time <= $end_time) 
{ 
// do something.... 
}