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

openmacnews

hi all,

i've php-5.1.2 built from src on OSX 10.4.6.

GD-2.0.33 + libpng-1.2.10 are built/installed/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

Weedpacket

This line

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

is setting both $_SESSION['test'] and $word to "blah".

There is nothing different about strings being passed by session that makes them different from other strings.

Perhaps if you showed us some genuine code that illustrates the problem we'd have something more substantive to work on? Take what you have, remove as much irrelevant stuff as you can without changing the bug, and post what's left.

openmacnews

hi,

Weedpacket wrote:
This line
	$word=$_SESSION['test']="blah";
is setting both $_SESSION['test'] and $word to "blah".

that's a dumb typo on my part ... sorry :-{

Weedpacket wrote:
There is nothing different about strings being passed by session that makes them different from other strings.

Perhaps if you showed us some genuine code that illustrates the problem we'd have something more substantive to work on? Take what you have, remove as much irrelevant stuff as you can without changing the bug, and post what's left.

thx!.

two files, "test.php" and "imagegen.php", as follows ...

test.php:

<html><head></head><body>

<?php
  session_start();
  $_SESSION['test'] = 'blah';
?>

<img src="imagegen.php" />

</body></html>

imagegen.php:

<?php

$word=$_SESSION['test'];
//$word='bleep';

$txtFont = '/... path .../BOOKOSBI.TTF';

$myImage =  imagecreatetruecolor(250,175);
$bgColor =  ImageColorAllocate($myImage,225,225,225);
$txtColor = ImageColorAllocate($myImage,0,0,0);

imagefill($myImage, 1, 1, $bgColor);
imagefttext($myImage, 28, 0, 50, 100, $txtColor, $txtFont, $word);

header ("Content-type: image/png");
imagepng($myImage);
imagedestroy($myImage);

?>

case 1)

imagegen.php:

	<?php
		$word=$_SESSION['test'];
		//$word='bleep';

result image --> [url]http://img205.imageshack.us/img205/5521/case17cb.png[/url]

case 2)

imagegen.php:

	<?php
		//$word=$_SESSION['test'];
		$word='bleep';

result image --> [url]http://img205.imageshack.us/img205/8759/case27ef.png[/url]

cheers,

richard

openmacnews

also,

case 3)

imagegen.php:

<?php
     $_SESSION['test']='bleep';
     $word=$_SESSION['test'];

i.e., using the SESSION var set locally, also WORKS, giving:

result image --> http://img205.imageshack.us/img205/8759/case27ef.png

Weedpacket

I notice you're not using session_start() on imagegen.php. So there's no session started on that page. So $_SESSION is empty....

openmacnews

Weedpacket wrote:
I notice you're not using session_start() on imagegen.php. So there's no session started on that page. So $_SESSION is empty....

php.ini -> session.auto_start = 1

even so,

session_start(); exists in the calling page ... is that not sufficient?

also, from b4,

a simple test with:
echo $word;
outputs
"blah"
as expected; i.e, the _SESSION var is passed.

which verifies that the SESSION is active ...