diff --git a/php_bencode_doc.php b/php_bencode_doc.php
index 8c89f75..c1901e3 100644
--- a/php_bencode_doc.php
+++ b/php_bencode_doc.php
@@ -201,6 +201,15 @@ function encode()
     {
     }
 
+    /**
+     * @param string|int $needle
+     * @param int $mode 0: search keys; 1: search values
+     * @return string[] paths of the matching entries
+     */
+    function search($needle, $mode)
+    {
+    }
+
     /**
      * @return array Return the array without meta
      *
@@ -380,6 +389,16 @@ function encode()
     {
     }
 
+    /**
+     * @param string|int $needle
+     * @param int $mode
+     * @return string[]
+     * @see bdict::search()
+     */
+    function search($needle, $mode)
+    {
+    }
+
     /**
      * @return array Return the array without meta
      * @see bdict::to_array()