/*
 * 檢查base64編碼的圖片格式
 */

function check_base64_img_string($img) {
    if (!isset($img)) {
        $msg = array(
            'code' => false,
            'message' => '引數錯誤'
        );
        return $msg;
    }

    $img = base64_decode($img);
    $img_size = getimagesizefromstring($img);
    if
 
 ($img_size == false) {
        $msg = array(
            'code' => false,
            'message' => '非圖片檔案'
        );
        return $msg;
    }

    $img_size[2] = intval($img_size[2]);
    if ($img_size[2] < 1 || $img_size[2] > 3) {//1 = GIF，2 = JPG，3 = PNG
        $msg = array(
            'code'
 
 => false,
            'message' => '圖片格式錯誤'
        );
        return $msg;
    }

    $ext = '';

    switch ($img_size[2]) {
        case 1:
            $ext = '.gif';
            break;

        case 2:
            $ext = '.jpg';
            break;

        case 3:
            $ext = '.png'
 
;
            break;
    }

    return array('code' => true, 'ext' => $ext);
}

//將 base64 後的圖片內容儲存為檔案
function save_base64_img_file($img_string = '', $type = '') {
    $type_array = array(
        'business_license', //營業執照
        'identity_card', //身份證
        'bocc', //中銀附件
        'driving_license', //行駛證
        'opening_accounts', //開戶許可
        'authorization', //授權委託書
        'price_single', //核價單
        'attached', //掛靠協議
        'policy', //保險單
        'invoice', //發票
    );

    if (!$img_string || !in_array($type, $type_array)) {
        return array(
            'code' => false,
            'message' => '檔案分類不存在'
        );
    }
    $request = check_base64_img_string($img_string);
    if (!$request['code']) {//沒通過檢查
        return $request;
    }

    $upload_path = str_replace('\\', '/', ROOT_PATH);
    $path = 'public/uploads/' . $type . '/' . date('Ymd') . '/';
    $upload_path = $upload_path . $path;

    if (!is_dir($upload_path)) {
        mkdir($upload_path, 0755, true);
    }

    $file_name = get_rand_str(15, 1) . $request['ext'];
    $file_path = $upload_path . '/' . $file_name;

    $state = file_put_contents($file_path, base64_decode($img_string));
    if ($state === false) {
        return array(
            'code' => false,
            'message' => '圖片儲存失敗'
        );
    }
    return array(
        'code' => true,
        'path' => '/' . $path . $file_name,
    );
}