Execute only one time and then wait set period of time before executing again

javascript php jquery cookies

PHP Snippet 1:

<?php

if(isset($_COOKIE['yourCookieName'])){
   //Do nothing
} else {
   $cookie_name = "yourCookieName";
   $cookie_value = "set";
   setcookie($cookie_name, $cookie_value, time() + (86400 * 30), "/"); // 86400 = 1 day
   ?>
    //Break out of php and run your javascript here
   <?php 
}
?>