add snippet for php logging

Note that li3 Logger must be in use.

vim/snippets/php.snippets

@@ -2,4 +2,6 @@
 snippet printpre
 	print_r('<pre>'); print_r($${1:check_variable}); exit;
 snippet vardump
-	var_dump(${1:check_variable}); exit;
+	var_dump($${1:check_variable}); exit;
+snippet printlog
+	Logger::debug('${1:description} ' . print_r($${2:variable}, true);