function wp_egrid_ajax_delete_photo_callback()
{
    $photo_id = $_REQUEST['photo_id'];
    $filename = $_REQUEST['filename'];
    //delete record in database
    require 'model/project_model.php';
    $projectModel = new ProjectModel();
    $projectModel->delete_image_by_id($photo_id);
    //delete file
    $uploadFolder = wp_upload_dir();
    $uploadFolder = $uploadFolder['baseurl'];
    $filename = $uploadFolder . DIRECTORY_SEPARATOR . 'wp_elastic_grid' . DIRECTORY_SEPARATOR . $filename;
    @unlink($filename);
    die;
}