如何优化clamav cl_scanfile，使它更快？平均需要15-20秒扫描文件。因此，如果在一个表单中我有2个上传字段，它将需要几乎40秒或更多，这将导致php最大执行时间错误。
我宁愿不改变php的执行时间。
有办法吗？
我的代码如下所示：

function upload() {
...
        // Checking element type based on element id.
        // if element type == file, check the file type. Based on the result, halt (redirect to failure) or continue
        foreach ($this->_controller->data['FormSubmission'] as $elementId => $fieldValue) {
...
...
                        //Checking The File for Virus
                        $retcode = cl_scanfile($fieldValue["tmp_name"], $virus_name);

                        //if Virus not found
                        if ($retcode != CL_VIRUS) {
                            //Check Directory if uploadPath is not a directory, make it
                            if (!is_dir($uploadPath)) {
                                mkdir($uploadPath, 0777, TRUE);
                            }

                            //filename
                            $now = date('Ymd-His');
                            $fileName = $now . '-' . $elementId . $fieldValue["name"];

                            $fullFilePath = $uploadPath . '/' . $fileName;
                            $uploading = move_uploaded_file($fieldValue["tmp_name"], $fullFilePath);
                            // change the value to uploadPath for ul/dl
                            $this->_controller->data["FormSubmission"][$elementId] = $fullFilePath;
                        } else {
                            //If Virus found, don't upload anything
                            $this->_controller->data["FormSubmission"][$elementId] = "";
                        }