Collections\Controller\Api::saveentry PHP Method

    public function saveentry()
    {
        $collection = $this->param("collection", null);
        $entry = $this->param("entry", null);
        if ($collection && $entry) {
            $entry["modified"] = time();
            $entry["_uid"] = @$this->user["_id"];
            $col = "collection" . $collection["_id"];
            // Check for uniqueeness of fields set as unique
            foreach ($collection["fields"] as $fieldDefinition) {
                $slugName = $fieldDefinition["name"] . "_slug";
                if (!empty($fieldDefinition["slug"]) && !empty($fieldDefinition["unique"]) && isset($entry[$slugName])) {
                    $collision = $this->app->db->findOne("collections/{$col}", [$slugName => $entry[$slugName]]);
                    if (!$collision) {
                        continue;
                    }
                    // New and colliding or other entry
                    if (!isset($entry["_id"]) || $entry["_id"] != $collision["_id"]) {
                        $this->app->response->status = 409;
                        return sprintf($this->app->helper("i18n")->get("There is already an entry in this collection with this slug for field '%s'."), $fieldDefinition["label"]);
                    }
                }
            }
            if (!isset($entry["_id"])) {
                $entry["created"] = $entry["modified"];
            } else {
                if ($this->param("createversion", null)) {
                    $id = $entry["_id"];
                    $colid = $collection["_id"];
                    $this->app->helper("versions")->add("coentry:{$colid}-{$id}", $entry);
                }
            }
            $this->app->db->save("collections/{$col}", $entry);
        }
        return $entry ? json_encode($entry) : '{}';
    }