PHP: Check mysql database every 10 seconds for any new rows

Question

I am making a php chat and am starting the php checking database part. So when a user types something into the chat, it gets recorded in the MySQL database, how would I chec

Answer 1

Make a while for 30 seconds, and check the db every second, once you find a record the while is being broken, also it is being broken when 30 secs are expired.

$sec = 1;
while($sec <= 30) {
   if(has record)
      Send to the user;
   $sec++;

   sleep(one sec here);
}

Use sleep for 10 secs in order to check every 10 secs...