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function mod_upload_image($request, $postName = 'img', $defaultPath = 'front/user/')
{
    $imgURL = '';
    $target_name = '';
    if (isset($_FILES['img']['name']) && $_FILES[$postName]['name'] != '') {
        $allowed =  array('gif', 'png', 'jpg');
        $filename = $_FILES[$postName]['name'];
        $ext = pathinfo($filename, PATHINFO_EXTENSION);
        $target_name = time() . rand(1111, 9999) . '-' . $filename;
        $target_file = $defaultPath .  $target_name;
        if (!in_array($ext, $allowed)) {
            echo 'Please upload valid image';
            exit;
        }

        $check = getimagesize($_FILES[$postName]["tmp_name"]);
        if ($check !== false) {
        } else {
            echo 'Please upload valid image';
            exit;
        }

        if (move_uploaded_file($_FILES[$postName]["tmp_name"], $target_file)) {
        }
    }

    return $target_name;
}