<?php /** * MIME detection code. * * @todo Maybe we could try to use fileinfo module if loaded */ declare(strict_types=1); namespace PhpMyAdmin; use function chr; use function mb_strlen; use function str_starts_with; /** * Handles mime type detection */ class Mime { /** * Tries to detect MIME type of content. * * @param string $test First few bytes of content to use for detection */ public static function detect(string $test): string { $len = mb_strlen($test); if ($len >= 2 && $test[0] === chr(0xff) && $test[1] === chr(0xd8)) { return 'image/jpeg'; } if ($len >= 3 && str_starts_with($test, 'GIF')) { return 'image/gif'; } if ($len >= 4 && str_starts_with($test, "\x89PNG")) { return 'image/png'; } return 'application/octet-stream'; } }