<snippet>
  <content><![CDATA[
echo '<pre>'; print_r(get_defined_vars()); echo '</pre>';
]]></content>
  <!-- Optional: Set a tabTrigger to define how to trigger the snippet -->
  <tabTrigger>dumpallvars</tabTrigger>
  <!-- Optional: Set a scope to limit where the snippet will trigger -->
  <scope>source.php</scope>
</snippet>