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

[Jacob Friis]

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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