title: how to trigger time events in php in multiple local timezones
body: <p>I have an array that looks like this </p>
  
  <pre><code>$alerts = array(
    array('alert' =&gt; '04:30:30', 'zone' =&gt; 'Europe/Berlin'),
    array('alert' =&gt; '04:30:30', 'zone' =&gt; 'Asia/Bangkok')
  );
  </code></pre>
  
  <p>the challenge is how to trigger this based on local time? 
  at times may change plus some continents have summer/winter times others don't .. </p>