php实现数组中索引关联数据转换成json对象的方法

public static function encode(&$var){ return '{'.implode(',',self::encodeExcute($var)).'}';}private static function encodeExcute(&$var){ $json = array(); switch (gettype($var)) {  case 'array':   foreach($var as $key=>$value)   {    if(is_array($value))    {     $json[] = '"'.$key.'":{'.implode(',',self::encodeExcute($value)).'}';     //$json[$key] = self::encode($value);    } elseif (is_object($value)) {     $json[] = "//"{$key}//":".json_encode($value->attributes);    } else {     echo 'ERROR 未知类型,还未解析';     Yii::app()->end();    }   }   break;  case 'object':   break; } return $json;}