That's my spot!

coursewatcher.php

<?php

$sub = 'CS';
$num = '115';
$term = '1141';
$key = '';
$g = json_decode(file_get_contents('https://api.uwaterloo.ca/v2/courses/'.$sub.'/'.$num.'/schedule.json?key='.$key.'&term='.$term));

foreach($g->data as $i)
{
  if(strpos($i->section, 'LEC') === 0) {
    if($i->enrollment_total < $i->enrollment_capacity) {
      echo 'Spot Open! '.$i->section;
    }
  }
}

?>