Yii Php: Getting values having a specific key in an associative array -

i have model/database table looks this

id | group_id| first_name | middle_name | last_name ------------------------------------------------------     |          |            |             |       ------------------------------------------------------ 

after retrieving model database:

say:

$people = personmodel::model()->findallbyattributes(array('group_id'=>$groupid)); 

and suppose i've retrieved 10 rows.. matching groupid given

i want store first_name of 10 rows matched.

i know can done by:

$personarray = array(); foreach($people $person){    $personarray[] = $person->first_name; } 

but there way, e.g. php function same thing? thank you!

$criteria = new cdbcriteria; $criteria->compare('group_id', $groupid); $criteria->limit = 10; $people = personmodel::model()->findall($criteria); $personarray = $list = chtml::listdata($people, 'id','first_name'); 

the chtml::listdata() returns associative array like: ['id'] => 'first_name' (attributes of model)