Centering text on a graphic

[Anon]

Hello, beginner here. I figured out how to center text horizontally but for the life of me I can't figure out how to center it vertically. So I end up just sticking in some number that sort of works... Could someone make a few minor alterations to this code to try and help me out?

Thanks,
Randy

<?
$x_image=450;
$y_image=100;
$id=imagecreate($x_image,$y_image);
$white = ImageColorAllocat($id,255,255,255);
$header="Text";
$ttf_font = "arial.ttf";
$head_size=40;

#I know the following is supposed to be different

$tmpy=ImageTTFBBox($head_size,0,$ttf_font,$header);
$tmpx=ImageTTFBBox($head_size,0,$ttf_font,$header);

$hx=($x_image-$tmpy[2])/2;
$hy=($y_image-$tempx[2])/2;

$cyan = ImageColorAllocate($id, 37,44,180);
ImageTTFText($id,$head_size,0,$hx,$hy,$cyan,$ttf_font,$header);
imagegif($id);
imagedestroy($id);
?>

[Anon]

in response to: http://www.phpbuilder.com/forum/archives/2/2000/10/4/111588

Looks like no one responded to this. I've been trying to figure this whole centering thing out and here is the fix to the code above...

$tmpy = ImageTTFBBox($size,0,$font,$string);
$tmpx = ImageTTFBBox($size,0,$font,$string);
$hx = ($image_x - $tmpx[2]) / 2;
$hy = ( ($image_y - ($tmpy[5] -1) ) / 2 ) + ($tmpy[5] -1) -2;

ImageTTFText takes the 'y' value for the bottom left corner. The first $hy calculation was finding the top left corner. So add to that the height of the text and you'll get the bottom left corner. One other note, the y value of the text is negative so multiply by a negative number to make it positive.

Also there is a mispelling in your var '$tempx', it should be '$tmpx'

Mike.