note 107069 modified in book.image by danbrown

In case your script is using output-buffering-functions somewhere, then you have to clear the buffer first ( with ob_clear() ), before outputting an image with a function like imagepng(). And you should make sure that no buffer will get send after outputing an image by using the ob_end_flush()-function. Furthermore you should check if a buffer has already been flushed somewhere before. This can be done using the headers_sent()-function. Here is the full solution: <?php if(headers_sent()){ die('Headers have been send somewhere within my script'); } ob_clean(); //Clears the buffer header('Content-type: image/png'); imagepng($img, NULL, 0, NULL); ob_end_flush(); //Now we send the header and image plus we make sure that nothing will get send from now on (including possible shutdown-functions and __destruct()-methods) till the end of page-execution ?> --was-- In case your script is using output-buffering-functions somewhere, then you have to clear the buffer first ( with ob_clear() ), before outputting an image with a function like imagepng(). And you should make sure that no buffer will get send after outputing an image by using the ob_end_flush()-function. Furthermore you should check if a buffer has already been flushed somewhere before. This can be done using the headers_sent()-function. Here is the full solution: ============== if(headers_sent()){ die('Headers have been send somewhere within my script'); } ob_clean(); //Clears the buffer header('Content-type: image/png'); imagepng($img, NULL, 0, NULL); ob_end_flush(); //Now we send the header and image plus we make sure that nothing will get send from now on (including possible shutdown-functions and __destruct()-methods) till the end of page-execution http://php.net/manual/en/book.image.php