diff --git a/AvocadoEdition_Light/lib/common.lib.php b/AvocadoEdition_Light/lib/common.lib.php
index 36c1bdf..add78f1 100644
--- a/AvocadoEdition_Light/lib/common.lib.php
+++ b/AvocadoEdition_Light/lib/common.lib.php
@@ -13,11 +13,14 @@ include_once __DIR__ . '/Hook/hook.extends.class.php';
  **
  *************************************************************************/
 
-// 마이크로 타임을 얻어 계산 형식으로 만듦
+ /**
+ * 마이크로타임을 반환
+ * @return float
+ * @deprecated use `microtime(true)`
+ */
 function get_microtime()
 {
-  list($usec, $sec) = explode(" ", microtime());
-  return ((float) $usec + (float) $sec);
+  return microtime(true);
 }