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<?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 mb_substr;
use function substr;
/**
* PhpMyAdmin\Mime class;
*/
class Mime
{
/**
* Tries to detect MIME type of content.
*
* @param string $test First few bytes of content to use for detection
*
* @return string
*/
public static function detect(&$test)
{
$len = mb_strlen($test);
if ($len >= 2 && $test[0] == chr(0xff) && $test[1] == chr(0xd8)) {
return 'image/jpeg';
}
if ($len >= 3 && substr($test, 0, 3) === 'GIF') {
return 'image/gif';
}
if ($len >= 4 && mb_substr($test, 0, 4) == "\x89PNG") {
return 'image/png';
}
return 'application/octet-stream';
}
}