GD text proc via php OK for local strings, but NOT for SESSION-passed strings. why?

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hi all,

php-5.1.2 built from src on OSX 10.4.6.

GD-2.0.33 + libpng-1.2.10 are built/enabled.

GD is working fine ... locally.

in a given php file, this returns an image as expected:

	...
	$word="blah";
	imagefttext($im, ... other params ... , $word);
	...
	header ("Content-type: image/png");
	imagepng($im);
	...

however, if rather than defining $word locally in the script, i

	$_SESSION['test']="blah";

elsewhere, then:

	$word=$_SESSION['test']="blah";
	imagefttext($im, ... other params ... , $word);
	imagepng($im);

i simply get a blank image.  NO error in either the browser or my apache
logs.

a simple test with:

	echo $word;

outputs

	"blah"

as expected; i.e, the _SESSION var *is* passed.

QUESTION: what's different about the string passed via SESSION?

thx!

richard

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