imagepng: how to save the output in a variable and then display it using img tag

Question

I want to save the output of the imagepng to a variable instead of dispaying it, and then want to use variable in a img tag to display the image.How can I do this?

I am using a smarty template for that I need to save the resultant image to variabe and then display it in a smarty template tpl file

Thanks it advance

Answer 1

imagepng — Output a PNG image to either the browser or a file

Try as below :

ob_start();
imagepng($png);
$imagedata = ob_get_contents();
ob_end_clean();
echo '<img src="data:image/png;base64,'.base64_encode($imagedata).'"/>';

Answer 2

Try using streams. Implement a stream wrapper that saves the contents written into a variable, and pass a stream of this type into imagepng .

For more details, see image outputs .