[PHP] imagestring() not working

[Ken Tozier]

Hi all,
I'm trying to create a little function that generates tabs dynamically 
and am having no luck with the imagestring() function. I checked out 
the documentation and even cut and pasted the example but it always 
chokes the browser when the page containing an imagestring() line is 
loaded.

Anyone see what I'm doing wrong?
Thanks
Ken
-----------------------------------------------------
Here's the script so far:
<?php
$font           = 1;
$font_width = ImageFontWidth($font);
$str_len         = strlen($in_tab_title);
$width          = $font_width * $str_len;
$height         = ImageFontHeight($font);
$image          = imagecreate($width, $height);
$inactive       = ImageColorAllocate($image, 118, 102, 205);
$poly           = imagerectangle($image, 0, 0, $width, $height, $inactive);
$over           = ImageColorAllocate($image, 138, 122, 243);
$active         = ImageColorAllocate($image, 230, 179, 115);
$text_color     = ImageColorAllocate($image, 255, 0, 0);
echo "<pre>";
var_dump($image);
var_dump($inactive);
var_dump($poly);
var_dump($over);
var_dump($active);
var_dump($text_color);
echo "</pre>";
// if I comment out the next line, the browser displays the above 
var_dumps
// but when it's uncommented, the browser displays a blank screen
imagestring ($image, 1, 0, 0,  "bobo", $text_color);

// header("Content-type: image/png");
// imagepng($im);
?>
And here's the return from gd_settings()
array(11) {
  ["GD Version"]=>
  string(27) "bundled (2.0.15 compatible)"
  ["FreeType Support"]=>
  bool(true)
  ["FreeType Linkage"]=>
  string(13) "with freetype"
  ["T1Lib Support"]=>
  bool(true)
  ["GIF Read Support"]=>
  bool(true)
  ["GIF Create Support"]=>
  bool(false)
  ["JPG Support"]=>
  bool(true)
  ["PNG Support"]=>
  bool(true)
  ["WBMP Support"]=>
  bool(true)
  ["XBM Support"]=>
  bool(true)
  ["JIS-mapped Japanese Font Support"]=>
  bool(false)
}
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