Fix for those who have plugin errors

So this plugin crashed and when i debugged it said undefined function exif_imagetype(). Turns out some servers have this disabled. What I did was to put this

if (!function_exists('exif_imagetype')) {
	function exif_imagetype($filename) {
		if ((list($width, $height, $type, $attr) = getimagesize($filename)) !== false) { 
			return $type;
		} 
		return false; 
	} 
}

at the start of the wp-content/plugins/square-thumbnails/admin/class-square-thumbnails-admin.php (https://wp-mix.com/php-fix-exif-imagetype-error/ code found here) and the error is gone now.