php - N1QL の準備済みステートメントが 100% 機能しない

Question

一部の変数が最終ステートメントに挿入されていない可能性がある (確かなことはわかりません) という問題があります。これが私の例です：

作品:

public static function findByPageAndFieldContains($recordsPerPage, $page, $field, $searchterm) {
    $query = CouchbaseN1qlQuery::fromString('SELECT * FROM `public_portal` WHERE `collection`=$collection AND TOSTRING('.$field.') LIKE "%'.$searchterm.'%" ORDER BY `_id` limit $limit offset $offset');
    $query->options['$collection'] = static::COLLECTION_NAME;
    //$query->options['$field'] = $field;
    $query->options['$limit'] = $recordsPerPage;
    $query->options['$offset'] = $recordsPerPage*($page-1);
    //$query->options['$searchterm'] = $searchterm;

    $result = DB::getDB()->query($query);
    var_dump($query);
    var_dump($result);
    $objects = array();
    foreach($result as $row) {
        $object = new static($row->{"public_portal"});
        $object->setId($row->{"public_portal"}->{"_id"});
        $objects[] = $object;
    }
    //var_dump($objects);
    return $objects;
    return $result;
}

デバッグ出力: debug01

動作しません：

public static function findByPageAndFieldContains($recordsPerPage, $page, $field, $searchterm) {
    $query = CouchbaseN1qlQuery::fromString('SELECT * FROM `public_portal` WHERE `collection`=$collection AND TOSTRING($field) LIKE "%$searchterm%" ORDER BY `_id` limit $limit offset $offset');
    $query->options['$collection'] = static::COLLECTION_NAME;
    $query->options['$field'] = $field;
    $query->options['$limit'] = $recordsPerPage;
    $query->options['$offset'] = $recordsPerPage*($page-1);
    $query->options['$searchterm'] = $searchterm;

    $result = DB::getDB()->query($query);
    var_dump($query);
    var_dump($result);
    $objects = array();
    foreach($result as $row) {
        $object = new static($row->{"public_portal"});
        $object->setId($row->{"public_portal"}->{"_id"});
        $objects[] = $object;
    }
    //var_dump($objects);
    return $objects;
    return $result;
}

デバッグ出力: debug02

基本的に、2 番目の例は結果を返しませんが、最初の例は問題なく動作します。

理由はありますか？