Review: Function that measures the width of a text string in pixels.

[Jacob Friis <lists@xxxxxxxxxxxxxxxx>]

I have created a function that will measure the width of a text string 
in pixels. It works ok.
If you have optimizations, please let me know.
Thanks,
Jacob

function txt_width ($txt) {
	$width = 0;
	$txt_len = strlen($txt);
	for ($n = 1; $n <= $txt_len; $n++) {
		switch (substr($txt, $n, 1)) {
			case 'l';
			case '.';
			case ' ';
			case '-';
			case 't';
				$width += 3;
				break;
			default :
				$width += 8;
				break;
		}
	}
	return $width;
}

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