creating an image in php, display works, saving to file does not

Question

I am creating an image via a php script using imagepng. This works fine and displays well on the website. even saving-as gives me a valid .png file

header( "Content-type: image/png" );
imagepng($my_img);
$save = "../sigs/". strtolower($name) .".png";
//imagepng($my_img, $save, 0, NULL);
imagepng($my_img, $save);

This is the end part of the code I use to generate the file and return it as picture on the website. but both options (tried the one marked out as well) dont save the file to the webserver for later use. The folder where the file is written is even set to chmod 777 at the moment to rule out any issues on that front. the $name is for sure a valid string without spaces.

Maybe you should post the code where you actually save the image to the filesystem? — rogeriopvl
– rogeriopvl, Commented Sep 12, 2009 at 0:00
@rogeriopvl - the code where the image is saved into the filesystem is there. please read the PHP manual about imagepng() function. — mauris
– mauris, Commented Sep 12, 2009 at 6:54

mauris · Accepted Answer · 2009-09-12 02:41:27Z

42

Make sure that PHP has permissions to write files to that folder. chmod probably only affects FTP users or particular users.

And try one at a time. i.e.:

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

then

$save = "../sigs/". strtolower($name) .".png";
imagepng($my_img, $save);

So that you can isolate errors.

Attempt saving in the same folder as the script first, see if there's any problem.

$save = strtolower($name) .".png";
imagepng($my_img, $save);

answered Sep 12, 2009 at 2:41

mauris

43.6k16 gold badges102 silver badges132 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Fons · Accepted Answer · 2009-09-12 06:49:07Z

Thanks a lot for you help on clearing my mind and having me look from a different angle. All had to do with rights of the file.

As the script generated the file, the rights are not set correct and overwriting is not possible.

after taking out:

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

I received an error message about not being able to write. when is set the file manual to chmod 755, the script worked like a charm.

so the new code now looks like this:

header( "Content-type: image/png" );
imagepng($my_img);
$save = "../sigs/". strtolower($name) .".png";
chmod($save,0755);
imagepng($my_img, $save, 0, NULL);
imagedestroy($my_img);

Setting the file to be writeable fixed the issue and all is working as intended.

Best regards Fons

jeroen · Accepted Answer · 2009-09-12 00:24:52Z

4

Are you sure the relative path is correct? That can be a bit confusing if that script is called from another script.

You could try to change the path to:

$save = $_SERVER['DOCUMENT_ROOT'] . "/sigs/" . strtolower($name) . ".png";

Edit: And of course check the return value of imagepng() and your error log

answered Sep 12, 2009 at 0:24

jeroen

91.8k22 gold badges117 silver badges132 bronze badges

Comments

walter1957 · Accepted Answer · 2017-03-01 19:05:20Z

2

Your code, Fons, provoked the usual problem I was having of displaying the Image created using the GD Library but disabling any Html code after the Php. By removing the line below

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

and only using the next 2 lines in Php I was able to save the file and then access the Image in the Html section (bottom line of code) without destroying the Html coding.

$save='./img/Graph.png'; chmod($save,0755);
imagepng($image,$save,0,NULL); imagedestroy($image);

<img width="500" height="350" align="top" alt="" src="./img/Graph.png" />

Thanks.

answered Mar 1, 2017 at 19:05

walter1957

651 silver badge10 bronze badges

Collectives™ on Stack Overflow

creating an image in php, display works, saving to file does not

4 Answers 4

Comments

Comments

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

4 Answers 4

Comments

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related