Bug #51556 [Fbk->Opn]: imagepng,imagegif not function properly

Edit report at http://bugs.php.net/bug.php?id=51556&edit=1

 ID:               51556
 User updated by:  luk-4u at hotmail dot com
 Reported by:      luk-4u at hotmail dot com
 Summary:          imagepng,imagegif not function properly
-Status:           Feedback
+Status:           Open
 Type:             Bug
 Package:          GD related
 Operating System: centos5 x86_64 GNU/Linux
 PHP Version:      5.2.6

 New Comment:

test.php:

<?php
ob_start();
//ob_end_clean();
header('Content-type: image/png');
imagepng(imagecreatefrompng('/home/webroot/a.png'));
//imagepng(imagecreatefrompng('/home/webroot/a.png'),
dirname(__FILE__).'/test.png');
//imagegif(imagecreatefrompng('/home/webroot/a.png'));
//imagejpeg(imagecreatefrompng('/home/webroot/a.png'));

exit;
?>

The script is as sime as above, and the environment is
nginx+fastcgi(php5.2.6), assume u hv a vhost setted up and the file
/home/webroot/a.png is available, just access it through
http://ur_vhost_name.com/test.php

3ks


Previous Comments:
------------------------------------------------------------------------
[2010-04-15 08:56:32] [email protected]

Thank you for this bug report. To properly diagnose the problem, we
need a short but complete example script to be able to reproduce
this bug ourselves. 

A proper reproducing script starts with <?php and ends with ?>,
is max. 10-20 lines long and does not require any external 
resources such as databases, etc. If the script requires a 
database to demonstrate the issue, please make sure it creates 
all necessary tables, stored procedures etc.

Please avoid embedding huge scripts into the report.



------------------------------------------------------------------------
[2010-04-15 06:46:02] luk-4u at hotmail dot com

change php ver

------------------------------------------------------------------------
[2010-04-15 03:40:59] luk-4u at hotmail dot com

Description:
------------
while running as cgi on nginx(the response is 'chunked' according to
firebug), and ob_start is activated using imagepng,imagegif to
outputimages to the browsers, these two are not correct, the browser
only received part of the image, while imagejpeg is correct. And without
ob_start or running as apache+mod_php(response not 'chunked') all three
are correct. And if add 
'ob_end_clean()' before imagepng, it worked correctly. 

phpinfo:

gd
GD Support 	enabled
GD Version 	bundled (2.0.34 compatible)
FreeType Support 	enabled
FreeType Linkage 	with freetype
FreeType Version 	2.2.1
GIF Read Support 	enabled
GIF Create Support 	enabled
JPG Support 	enabled
PNG Support 	enabled
WBMP Support 	enabled
XBM Support 	enabled 

Test script:
---------------
ob_start();
header('Content-type: image/png');
imagepng(imagecreatefrompng('/home/webroot/a.png'));
//imagegif(imagecreatefrompng('/home/webroot/a.png'));
//imagejpeg(imagecreatefrompng('/home/webroot/a.png'));
exit;

Expected result:
----------------
the image rendered entirely 

Actual result:
--------------
firefox:the image rendered partly 
ie6: imagepng and imagegif behaves more weirdly 


------------------------------------------------------------------------



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Edit this bug report at http://bugs.php.net/bug.php?id=51556&edit=1