How can I programmatically create nested where clauses with Zend\Db\Sql component? - zend-framework

Question

I've tried using the following code to accomplish it, but the unnest function returns an error:
foreach($params as $key=>$param) {
if(strpos($param, ',') !== false) {
$where = new \Zend\Db\Sql\Where();
$where->nest();
$param_arr = explode(',', $param);
$entered_once = 0;
foreach($param_arr as $p) {
$where->equalTo($key, $p);
if($entered_once < count($param_arr)) {
$where->or;
}
$entered_once++;
}
$where->unnest();
$select->where($where);
}
else {
$select->where(array($key => $param));
}
}

Answer 1

I've figured out what I'm doing wrong: I didn't realize that the nest() function returned a brand new PredicateSet and that's what I needed to call everything on. The solution is as follows:
foreach($params as $key=>$param) {
if(strpos($param, ',') !== false) {
$where = new \Zend\Db\Sql\Where();
$predicate_set = $where->nest();
$param_arr = explode(',', $param);
$entered_once = 0;
foreach($param_arr as $p) {
$predicate_set->equalTo($key, $p);
if($entered_once < count($param_arr)) {
$predicate_set->or;
}
$entered_once++;
}
$predicate_set->unnest();
$select->where($where);
}
else {
$select->where(array($key => $param));
}
}