Description:
------------
---
From manual page: http://www.php.net/function.imagettfbbox
---

The bounding box dimensions are not accurate sometimes being off by as much as a full character.

Test script:
---------------
<?php
$text = 'hello there';
$box = imagettfbbox(12,0,'arial.ttf',$text);
$width = abs($box[0]-$box[2]);
$text = str_replace(' ','&nbsp;',$text);

echo '<svg width="500" height="200">
    <g transform="scale(5)">
        <text x="0" y="20" style="font-family:arial; font-size:12pt;">'.$text.'</text>
        <rect x="0" y="10" width="'.$width.'" height="20" style="fill-opacity:0.5; fill:yellow;" />
    </g>
</svg>';

exit;
?>