压缩扩展php数组对象
最近有一个需求：将rar压缩文件里面的文件名、大小获取出来，解析成json输出来；
查阅了无数资料，得知添加php_rar.dll(如果是zip的话，就添加php_zip.dll扩展)，最后通过程序得到rar的相关内容，但对里面获取到的内容格式不知道怎么解析成json，求大神指点一二。
$rar_file = rar_open('222.rar') or die("failed to open rar archive"); $entries_list = rar_list($rar_file); header('content-type: text/plain'); print_r($entries_list);
得到数据如下：
array ( [0] => rarentry object ( [rarfile:rarentry:private] => rararchive object ( )
[position:rarentry:private] => 0 [name:rarentry:private] => tar.php [unpacked_size:rarentry:private] => 64332 [packed_size:rarentry:private] => 11726 [host_os:rarentry:private] => 2 [file_time:rarentry:private] => 2012-07-09 23:47:06 [crc:rarentry:private] => 69e1487f [attr:rarentry:private] => 128 [version:rarentry:private] => 29 [method:rarentry:private] => 51 [flags:rarentry:private] => 32928 ) [1] => rarentry object ( [rarfile:rarentry:private] => rararchive object ( ) [position:rarentry:private] => 1 [name:rarentry:private] => upload.php [unpacked_size:rarentry:private] => 2461 [packed_size:rarentry:private] => 1033 [host_os:rarentry:private] => 2 [file_time:rarentry:private] => 2012-07-09 23:47:06 [crc:rarentry:private] => ecc4a20d [attr:rarentry:private] => 128 [version:rarentry:private] => 29 [method:rarentry:private] => 51 [flags:rarentry:private] => 32928 ) [2] => rarentry object ( [rarfile:rarentry:private] => rararchive object ( ) [position:rarentry:private] => 2 [name:rarentry:private] => urlupload.php [unpacked_size:rarentry:private] => 1877 [packed_size:rarentry:private] => 864 [host_os:rarentry:private] => 2 [file_time:rarentry:private] => 2012-07-09 23:47:06 [crc:rarentry:private] => 44a999a9 [attr:rarentry:private] => 128 [version:rarentry:private] => 29 [method:rarentry:private] => 51 [flags:rarentry:private] => 32928 ) [3] => rarentry object ( [rarfile:rarentry:private] => rararchive object ( ) [position:rarentry:private] => 3 [name:rarentry:private] => user.php [unpacked_size:rarentry:private] => 402 [packed_size:rarentry:private] => 222 [host_os:rarentry:private] => 2 [file_time:rarentry:private] => 2012-07-09 23:47:06 [crc:rarentry:private] => 22db657e [attr:rarentry:private] => 128 [version:rarentry:private] => 29 [method:rarentry:private] => 51 [flags:rarentry:private] => 32928 ) )