name : FileTypeDetector.php <?php namespace Maatwebsite\Excel\Helpers; use Maatwebsite\Excel\Exceptions\NoTypeDetectedException; use Symfony\Component\HttpFoundation\File\UploadedFile; class FileTypeDetector { /** * @param $filePath * @param string|null $type * @return string|null * * @throws NoTypeDetectedException */ public static function detect($filePath, string $type = null) { if (null !== $type) { return $type; } if (!$filePath instanceof UploadedFile) { $pathInfo = pathinfo($filePath); $extension = $pathInfo['extension'] ?? ''; } else { $extension = $filePath->getClientOriginalExtension(); } if (null === $type && trim($extension) === '') { throw new NoTypeDetectedException(); } return config('excel.extension_detector.' . strtolower($extension)); } /** * @param string $filePath * @param string|null $type * @return string * * @throws NoTypeDetectedException */ public static function detectStrict(string $filePath, string $type = null): string { $type = static::detect($filePath, $type); if (!$type) { throw new NoTypeDetectedException(); } return $type; } }