Warning: arraymap() expects parameter 1 to be a valid callback, class 'TypechoJson' not found in /mnt/sdcard/www/var/Json.php on line 243

Warning: Invalid argument supplied for foreach() in /mnt/sdcard/www/var/Json.php on line 245

Warning: join(): Invalid arguments passed in /mnt/sdcard/www/var/Json.php on line 252

环境是openwrt+uhttpd+php+mysql。
什么地方出了问题？

php代码：
// treat it like a regular array

$elements = array_map(array('Typecho_Json', '_encode'), $var); foreach ($elements as $element) { if (self::_is_error($element)) { return $element; } } return '[' . join(',', $elements) . ']';