# Image Mime Type Sniffer

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Gets mime type of common *image* files by sniffing the file content, looking for signatures.

The fact that this library limits its ambition to sniff images makes it light and simple. It is also quite fast. Most other sniffers iterates through all common signatures, however this library uses a mix of finite-state machine approach and iteration to achieve a good balance of speed, compactness, simplicity and readability.

The library recognizes the most widespread image formats, such as GIF, JPEG, WEBP, AVIF, JPEG-2000 and HEIC.

# Usage

```php
use \ImageMimeTypeSniffer\ImageMimeTypeSniffer;

$mimeType = ImageMimeTypeSniffer::detect($fileName);  
if (is_null($mimeType)) {
  // mimetype was not detected, which means the file is probably not an image (unless it is a rare type)
} else {
  // It is an image, and we know the mimeType
}
```

PS: An `\Exception` is thrown if the file is unreadable.

# List of recognized image types:

- application/psd
- image/avif
- image/bmp
- image/gif
- image/heic
- image/jp2
- image/jp20
- image/jpeg
- image/jpm
- image/jpx
- image/png
- image/svg+xml
- image/tiff
- image/webp
- image/x-icon
- video/mj2

TODO: image/heif


# Alternatives

I have created a library that uses this library as well as other methods (*finfo*, *exif_imagetype*, etc) for determining image type. You might want to use that instead, to cover all bases. It is available here: [image-mime-type-guesser](https://github.com/rosell-dk/image-mime-type-guesser).

There are also other PHP mime type sniffers out there:

- https://github.com/Intervention/mimesniffer
- https://github.com/Tinram/File-Identifier
- https://github.com/shanept/MimeSniffer
- https://github.com/zjsxwc/mime-type-sniffer
- https://github.com/thephpleague/mime-type-detection/tree/main/src