Posted by Peter on 09/27/33 11:31

Very perplexing. This function creates a png image of a random string (this
is to filter out blogging spam). It should be very straight forward.


function createImage( $text=0 )
{
$img_dir = '/tmp';

(snip!)

$filename = "$img_dir/" . randomString(12) . '.png';

if ( ! is_writable($filename) )
echo ("Can't write to $filename<br>");

ImagePNG( $image, $filename );
ImageDestroy( $image );

return array(
'filename' => $filename,
'passkey' => $text
);
}


When I call this function, it prints on the webpage, e.g.

Can't write to /tmp/TsP1gTUNwAOyQ.png

However, that file clearly exists:

$ ll /tmp/TsP1gTUNwAOyQ.png
-rw-r--r-- www-data www-data 200 2005-11-09 /tmp/TsP1gTUNwAOyQ.png

How can is_writable() be wrong?



In related wierdness, I use this function like so:

$retval = createImage();
$filename = $retval['filename'];
$passkey = $retval['passkey'];
echo "<img src=\"$filename\" />";

But the image doesn't show up in the browser. When I look at the page
source, the statement is there and looks correct:

<img src="/tmp/c2GfviA4r4b47.png" />

and I can even view the image with xv and gimp, however, the image is simply
not on the webpage.

I strongly suspect that these two oddities are related, but I'm running out
of ideas. Anyone have any suggestions?

Thanks,
Pete

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