问更新ACF中继器，只保存上一次上传的文件

EN

$post_id = $_POST['post_id'];
$params['field_58fcbc968b60c'] = $_POST['user_name'];

if(isset($_POST['expert_question']) && !empty($_POST['expert_question']))
{
    $params['field_58fcbcc08b60d'] = addslashes($_POST['expert_question']);
}

if(isset($_POST['user_email_addr']) && !empty($_POST['user_email_addr']) && filter_var($_POST['user_email_addr'], FILTER_VALIDATE_EMAIL))
{
    $user_email = $_POST['user_email_addr'];
}



if(count($_FILES) && isset($_FILES['expert_question_file']) && !empty($_FILES['expert_question_file']['name']))
{
    $allow_extension = ['pdf','png','jpg','gif','doc','docx','xls','csv'];
    $file_info = wp_handle_upload($_FILES['expert_question_file'], ['test_form' => false]);
    $temp = explode(".",$file_info['file']);
    $extension = end($temp);
    if(in_array(strtolower($extension),$allow_extension))
    {

        $wp_upload_dir = wp_upload_dir();
        $attachment = [
            'guid' => $wp_upload_dir['url'].'/'.basename($file_info['file']),
            'post_mime_type' => $file_info['type'],
            'post_content' => '',
            'post_status' => 'inherit'
        ];

        $attachment_id = wp_insert_attachment($attachment);
        $params['field_58fcbcfd8b60e'] = $attachment_id;
    }else{
        $res = "Invalid file extension";
    }

}

if(have_rows('field_58fcbc758b60b',$post_id)){
    $expert_questions_repeater = get_field('field_58fcbc758b60b', $post_id);
    $expert_questions_repeater[] = $params;
}else{
    $expert_questions_repeater = [];
    $expert_questions_repeater[] = $params;
}

update_field('field_58fcbc758b60b', $expert_questions_repeater, $post_id);