Here is a mapping of mime type to extension for images in PHP array

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$mimes = [
            'image/bmp' => 'bmp',
            'image/x-bmp' => 'bmp',
            'image/x-bitmap' => 'bmp',
            'image/x-xbitmap' => 'bmp',
            'image/x-win-bitmap' => 'bmp',
            'image/x-windows-bmp' => 'bmp',
            'image/ms-bmp' => 'bmp',
            'image/x-ms-bmp' => 'bmp',
            'image/cdr' => 'cdr',
            'image/x-cdr' => 'cdr',
            'image/gif' => 'gif',
            'image/x-icon' => 'ico',
            'image/x-ico' => 'ico',
            'image/vnd.microsoft.icon' => 'ico',
            'image/jp2' => 'jp2',
            'image/jpx' => 'jp2',
            'image/jpm' => 'jp2',
            'image/jpeg' => 'jpeg',
            'image/pjpeg' => 'jpeg',
            'image/png' => 'png',
            'image/x-png' => 'png',
            'image/vnd.adobe.photoshop' => 'psd',
            'image/svg+xml' => 'svg',
            'image/tiff' => 'tiff',
            'image/webp' => 'webp',
        ];