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<?php namespace Mpdf\Image; class ImageTypeGuesser { /** * @param string $data * * @return null|string */ public function guess($data) { if (in_array(substr($data, 6, 4), ['JFIF', 'Exif'], true) || strpos($data, chr(255) . chr(216)) === 0) { // 0xFF 0xD8 // mpDF 5.7.2 return 'jpeg'; } if (in_array(substr($data, 0, 6), ['GIF87a', 'GIF89a'], true)) { return 'gif'; } if (strpos($data, chr(137) . 'PNG' . chr(13) . chr(10) . chr(26) . chr(10)) === 0) { return 'png'; } if (strpos($data, chr(215) . chr(205) . chr(198) . chr(154)) === 0) { return 'wmf'; } if (preg_match('/<svg.*<\/svg>/is', $data)) { return 'svg'; } if (strpos($data, 'BM') === 0) { return 'bmp'; } return null; } }