fixed 5.3 syntax

Author: longbai

src/Qiniu/functions.php

@@ -51,13 +51,13 @@ function base64_urlSafeDecode($str)
      */
     function json_decode($json, $assoc = false, $depth = 512, $options = 0)
     {
-        static $jsonErrors = [
+        static $jsonErrors = array(
             JSON_ERROR_DEPTH => 'JSON_ERROR_DEPTH - Maximum stack depth exceeded',
             JSON_ERROR_STATE_MISMATCH => 'JSON_ERROR_STATE_MISMATCH - Underflow or the modes mismatch',
             JSON_ERROR_CTRL_CHAR => 'JSON_ERROR_CTRL_CHAR - Unexpected control character found',
             JSON_ERROR_SYNTAX => 'JSON_ERROR_SYNTAX - Syntax error, malformed JSON',
             JSON_ERROR_UTF8 => 'JSON_ERROR_UTF8 - Malformed UTF-8 characters, possibly incorrectly encoded'
-        ];
+        );
 
         $data = \json_decode($json, $assoc, $depth, $options);