imagettfbbox problem

[Artem Kozmin]

I use imagettfbbox() function to get string width:

$bounds = imagettfbbox(10, $font_angle, $font_file, "This space is for
rent :)");
$width = $bounds[4] - $bounds[0];
$bounds = imagettfbbox(10, $font_angle, $font_file, "The Pyramid of Khufu");
$width = $bounds[4] - $bounds[0];

It returns 105 as width for two strings above.

if we change font size to 14, width of string "This space is for rent
:)" is 155, and width of string  "The Pyramid of Khufu" is 146.

Note these strings have same width in font size 10 and they have
different width in font size 14.
Is it problem with TTF font resize?

I use PHP 4.3.11 and GD bundled (2.0.28 compatible)
Best regards, Artem

[Barand]

I suspect it's because any slight differences in individual character widths become more apparent with larger font sizes