Add json.php for php 5.5

helper.php

@@ -2,6 +2,15 @@
 
 $config = require PATH_BASE . '/config.php';
 
+if ( ! function_exists('json_encode')) {
+  require_once('json.php');
+
+  function json_encode($var) {
+    $JSON = new Services_JSON;
+    return $JSON->encode($var);
+  }
+}
+
 function connect_db()
 {
     global $config;