从字段中提取值的有效方法

One of my plugin is storing data in form of

a:2:{i:0;s:20:\"HELM Operational (O)\";i:1;s:19:\"HELM Management (M)\";}

In database . I want to get the values such as "HELM Operational,HELM Management" in php . How can i extract the values and get it into a variable in the desired form . I know we can use Explode to explode after " but there is dynamic non wanted values in between such as i:1,s:19 etc which will be different every time . Is this possible using php to get the desired outcome ?

If you can't fix the malformed data at source:

$data = 'a:2:{i:0;s:20:\"HELM Operational (O)\";i:1;s:19:\"HELM Management (M)\";}';
$data = unserialize(str_replace('\"', '"', $data));
var_dump($data);