quickly gives you a php print_r line where you can just type in the variable you want to print_r, on

phppre

<snippet>
  <content><![CDATA[
echo '<pre>';
	print_r(\$$1);
echo '</pre>';
]]></content>
	<!-- Optional: Set a tabTrigger to define how to trigger the snippet -->
	<tabTrigger>phppre</tabTrigger>
	<!-- Optional: Set a scope to limit where the snippet will trigger -->
	<scope>source.php</scope>
</snippet>