function get_im tmp_name switch exif_imagetype tmp_name case IMAGETYPE

<?
function get_im($tmp_name) {
	switch(exif_imagetype($tmp_name)) {
    	case IMAGETYPE_JPEG:
        	return imagecreatefromjpeg($tmp_name);
            break;
        case IMAGETYPE_PNG:
        	return imagecreatefrompng($tmp_name);
            break;
        case IMAGETYPE_GIF:
        	return imagecreatefromgif($tmp_name);
            break;
        default:
        	return false;
        break;
    }
}

$im = get_im($tmp_name);

echo imagesy($im);