Length of text for GD

[SharkBait]

Hi,

  I am trying to center text on an image I am creating with the GD.

I am currently using [code=php:0]imagestring()[/code] but with that I am not specifing a font like I would with imagettftext()

So if I could do something like this:
[code]
<?php

$fontWidth = imagefontwidth($font);
$stringLength = strlen("My String") * $fontWidth;

?>
[/code]
But because I am using [code=php:0]imagestring()[/code] I am unsure as how to figure out the default font's width because I dont set a font.

Should I use a font and just use imagettftext instead of imagestring?

[Barand]

With imagestring() the 2nd arg is the font number to use. Use that same font number in in imagefontwidth()

[SharkBait]

Ok my centering isnt working.

My image is 50 in width.

This is what I have:

[code]
<?php

$imgWidth = 50;

$text = "HELP";
$fontWidth = 5;
$strLength = strlen($text) * $fontWidth;
$start = ($imgWidth - $strLength) / 2;

imagestring($img, $fontWidth, $start, 30, $text, $black);
?>
[/code]

But it doesn't look centered.

I also do [code=php:0]list($imgWidth, $imgHeight, $imgType, $imgAttr) = getimagesize('graphics/speed.gif');[/code] and that makes imgWidth = 50

Is my logic for centering incorrect?