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I have a PHP page containing a form(method post). On the submit of the button, I create an image using imagecreatetruecolor and imagesetpixel. Then, I want to show this picture after the form. I tried saving the image to a file using imagepng($img, 'test.png'); and echo '<img src="test.png">';, but that doesn't get the new image. How can I achieve that?

qlenders
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Ginso
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  • Make sure that the absolute path you stored it in is correct, in contrast to the relative path you need to use in your ` – droopsnoot Sep 02 '20 at 12:08
  • Does this answer your question? [Displaying php generated image on a page](https://stackoverflow.com/questions/3734867/displaying-php-generated-image-on-a-page) – Ron Sep 02 '20 at 12:11
  • @Ginso do you want to show the preview of image and upload image after that? – Ankit Jindal Sep 02 '20 at 12:15
  • i just want to show the image somehow(such that i can rightclick and "copy image"). using the the absolute path changes nothing, i still get the old image until i force-reload. – Ginso Sep 03 '20 at 14:47
  • If you have to use a force reload of your page, then this is a caching issue, not anything related to PHP itself – Nico Haase Oct 02 '20 at 14:00

1 Answers1

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You need to determine where your image is being created when you call imagepng(), then ensure your image tag has the correct path to it.

For example:

$root = $_SERVER['DOCUMENT_ROOT'];
imagepng($img, $root . '/images/test.png')

Your image will then be available at:

https://example.com/images/test.png

And you can set your image source accordingly:

<img src="/images/test.png">
BadHorsie
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  • the image is saved correctly, my problem is, that the resource is not updated until i force-reload the page – Ginso Sep 03 '20 at 14:48
  • It's probably just a caching issue then. See here https://stackoverflow.com/questions/728616/disable-cache-for-some-images – BadHorsie Sep 03 '20 at 15:46