Targeting specific group when creating a campaign with mailChimp API - php

Question

I cannot seem to figure out how to send to a group in my list using mailChimp API
My code looks like this:
$conditions = array('field'=>'interests-1', 'op'=>'all', 'value'=>'myGroup');
$opts = array('match'=>'any', 'conditions'=>$conditions);
$retval = $api->campaignSegmentTest($listId, $opts);
But this yields bool(false). When fetched by
$retval = $api->listInterestGroupings($listId);
my list looks like this:
array(1) {
[0]=>
array(5) {
["id"]=>
int(1)
["name"]=>
string(10) "myList"
["form_field"]=>
string(5) "radio"
["display_order"]=>
string(1) "0"
["groups"]=>
array(5) {
[0]=>
array(4) {
["bit"]=>
string(1) "1"
["name"]=>
string(9) "myGroup"
["display_order"]=>
string(1) "1"
["subscribers"]=>
int(1)
}
[1]=>
array(4) {
["bit"]=>
string(1) "2"
["name"]=>
string(9) "myGroup_2"
["display_order"]=>
string(1) "2"
["subscribers"]=>
int(1)
}
}
}
}
I have looked in the API documentation and searched for the answer, but cannot seem to figure it out. Grateful for help!

Answer 1

Looks like you are using the PHP wrapper - the first thing to do, like the examples included with it do, is to check for any errors by looking at $api->errorCode before messing with the $retval.
When you do that I'm certain you will see an error telling you that you haven't passed a proper "conditions" parameter since it is an array of arrays, not an array.