sleep - PHP: run php code every 10 seconds -

i want run php code every 10 seconds, code have problem

because functions random delay ( 2 seconds until 5 seconds )

i want exact run code on 10 seconds , passes function if time out or if more 5 seconds

code :

for($i=0;$i<=5;$i++){      echo date('y-m-d h:i:s').'<br />';      get_file_content('....'); //load file server ( make 2 seconds until 5 seconds )      sleep(10); // sleep 10 seconds } 

result 1 :

2017-04-14 15:25:35 2017-04-14 15:25:46 2017-04-14 15:25:57 2017-04-14 15:26:08 2017-04-14 15:26:19 2017-04-14 15:26:30 

another result :

2017-04-14 15:32:22 2017-04-14 15:32:34 2017-04-14 15:32:44 2017-04-14 15:33:01 2017-04-14 15:33:17 2017-04-14 15:33:29 

i want result ( load file make long time )

exact result :

2017-04-14 15:25:00 2017-04-14 15:25:10 2017-04-14 15:25:20 2017-04-14 15:25:30 2017-04-14 15:25:40 2017-04-14 15:25:50 

how in lines of :

for($i=0;$i<=5;$i++){ $previoustime = date();  echo date('y-m-d h:i:s').'<br />';  get_file_content('....'); //load file server ( make 2 seconds until 5 seconds )  sleep(10-(date()-$previoustime)); }