| fletch at pobox dot com 2006-09-17, 3:57 am |
| ID: 38794
Comment by: fletch at pobox dot com
Reported By: bytewise at gmx dot net
Status: Assigned
Bug Type: Documentation problem
PHP Version: Irrelevant
Assigned To: pajoye
New Comment:
This is also present, at least in imagepng(), in 5.1.4.
imagepng( $img, NULL ) triggers this error:
Warning: imagepng() [function.imagepng]: Unable to open '' for writing
Previous Comments:
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[2006-09-12 19:14:43] bytewise at gmx dot net
Then I guess the documentation *really* needs an update, because it
looks totally different. There is no mention of the quality and filter
arguments.
Additionally, the empty string is *also* invalid, not only NULL.
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[2006-09-12 18:23:42] pajoye@php.net
The function accepts the following arguments set:
imagepng($im, "filename"); save $im as filename
# save $im as filename, using compression and $filter
imagepng($im, "filename", $compression, $filter);
# Output $im, using compression and $filter
imagepng($im, NULL, $compression, $filter);
NULL is invalid if the compression and filter arguments are not used.
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[2006-09-12 16:09:42] bytewise at gmx dot net
Description:
------------
The documentation of imagepng (in English and German) states that the
second parameter may be null or the empty string:
"
bool imagepng ( resource image [, string filename] )
The filename argument is optional, and if left off or filled with a
NULL value, the raw image stream will be output directly.
"
This is not the case, at least in php 5.1.6 this function does not work
anymore if given an empty string or null as second parameter. It will
merely generate a warning ("Unable to open '' for writing"), and output
some trash, not a real png image.
This problem is NOT related to sending a bad header.
The same code worked fine for me in php 5.0.4; after an upgrade to
5.1.6 it stopped working. I removed the second (null) parameter to
imagepng, and it worked again. Only it took a couple of hours to find
out :)
There at least 2 bug reports that are related to this, both of which
have been closed (nothing having been done about them):
http://bugs.php.net/35061
http://bugs.php.net/36464
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Edit this bug report at http://bugs.php.net/?id=38794&edit=1
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