hybrid.php

public function hybridSearch($collectionName, $query, array $queryVector, $additionalParams = [], $recursionDepth = 0)
    {
        $client = $this->getTypesenseClient();
        $totalResultRequested = $additionalParams['k'] ?? 100;
        $distanceThreshold = $additionalParams['distance_threshold'] ?? 0.7;
        $searchParams = array_merge([
            'q' => $query,
            'query_by' => $this->helper->getKeywordFieldsByCollection($collectionName),
            'query_by_weights' => $this->helper->getQueryByWeight($collectionName),
            'vector_query' => 'embedding_vector:([' . implode(',', $queryVector) . '], k:' . $totalResultRequested . ', alpha:0.6, distance_threshold:'.$distanceThreshold.')',
            'per_page' => $additionalParams['per_page'] ?? 20,
            'exclude_fields' => 'embedding_vector',
            'rerank_hybrid_matches' => true,
            'drop_tokens_threshold' => 0,
            'sort_by' => '_text_match:desc',
            'prioritize_exact_match' => true,
        ], $additionalParams);

        $entityType = $this->helper->extractEntityType($collectionName);
        if($entityType === 'product') {
            $attributeSetId = Data::WALLPAPER_ATTRIBUTE_SET;
            if(preg_match('/sticker|decal/i', $query)) {
                $attributeSetId = Data::WALLDECAL_ATTRIBUTE_SET;
            }

            $textMatchPrioritized = false;
            $rankingScorePrioritized = false;

            $wordCount = str_word_count($query);
            if($wordCount === 1) {
                $rankingScorePrioritized = true;
            } else {
                foreach ($this->helper->getRankingScorePrioritizedKeywords() as $rankingScorePrioritizedKeyword) {
                    if (stripos($query, $rankingScorePrioritizedKeyword) !== false) {
                        $rankingScorePrioritized = true;
                        break;
                    }
                }
            }
            foreach ($this->helper->getTextMatchPrioritizedKeywords() as $textMatchPrioritizedKeyword) {
                if (stripos($query, $textMatchPrioritizedKeyword) !== false) {
                    $textMatchPrioritized = true;
                }
            }

            if($rankingScorePrioritized) {
                $searchParams['sort_by'] = '_eval(attribute_set:='.$attributeSetId.'):desc,  ranking_bucket:desc, _text_match:desc';
            } else {
                $searchParams['sort_by'] = '_eval(attribute_set:='.$attributeSetId.'):desc, _text_match(buckets: 10):desc, ranking_score:desc';
            }
            if($textMatchPrioritized) {
                $searchParams['sort_by'] = '_eval(attribute_set:='.$attributeSetId.'):desc, _text_match:desc, ranking_bucket:desc';
            }
        }

        $multiSearchParams = [
            'searches' => [
                array_merge(['collection' => $collectionName], $searchParams),
            ]
        ];
        $response = $client->getMultiSearch()->perform($multiSearchParams);
        if(isset($response['results'][0]['found']) && $response['results'][0]['found'] < 5 && $recursionDepth === 0) {
            $additionalParams['distance_threshold'] = 0.85;
            return $this->hybridSearch($collectionName, $query, $queryVector, $additionalParams, $recursionDepth + 1);
        }
        return $response['results'][0] ?? [];
    }