Problems using Image_Graph

jon3k

The following:

<?php
	include 'Image/Graph.php';    

	$Graph =& Image_Graph::factory('graph', array(400, 300));
	$Plotarea =& $Graph->addNew('plotarea');
	$Dataset =& Image_Graph::factory('dataset');
	$Dataset->addPoint('Denmark', 10);
	$Dataset->addPoint('Norway', 3);
	$Dataset->addPoint('Sweden', 8);
	$Dataset->addPoint('Finland', 5);
	$Plot =& $Plotarea->addNew('bar', &$Dataset);
	$Graph->done();
?>

Produces ...

Warning: Cannot modify header information - headers already sent by (output started at /var/www/recon/jon/graph.php:10) in /usr/share/pear/Image/Graph/Driver.php on line 525

Warning: Cannot modify header information - headers already sent by (output started at /var/www/recon/jon/graph.php:10) in /usr/share/pear/Image/Graph/Driver.php on line 526

Warning: Cannot modify header information - headers already sent by (output started at /var/www/recon/jon/graph.php:10) in /usr/share/pear/Image/Graph/Driver.php on line 527

Warning: Cannot modify header information - headers already sent by (output started at /var/www/recon/jon/graph.php:10) in /usr/share/pear/Image/Graph/Driver.php on line 528

Warning: Cannot modify header information - headers already sent by (output started at /var/www/recon/jon/graph.php:10) in /usr/share/pear/Image/Graph/Driver/GD/PNG.php on line 104

Warning: Cannot modify header information - headers already sent by (output started at /var/www/recon/jon/graph.php:10) in /usr/share/pear/Image/Graph/Driver/GD/PNG.php on line 105
&#65533;PNG

And, after ?PNG, it spits out a mass of upperascii. Like instead of writing the file somewhere, its just printing it out.

Any ideas?

bradgrafelman

What's on line 10 of graph.php ? (It'll probably be more beneficial for us to see the context of that line as well, so paste lines 7-13, for example).

jon3k

Well, its worth mentioning that this is the PEAR Image_Graph package, so I'm sure its something I'm doing wrong. Line 10 is just the beginning of block of php code, its actually just "<?php" in my graph.php which just includes the Image_Graph Graph.php - the actual error is occuring in the Driver.php, so I'm looking into that now.

jon3k

Here are the offending lines from Driver.php:

    function done($param = false)
    {
        if ($param === false) {
            header('Expires: Tue, 2 Jul 1974 17:41:00 GMT'); // Date in the past
            header('Last-Modified: '.gmdate('D, d M Y H:i:s').' GMT'); // always modified
            header('Cache-Control: no-cache, must-revalidate'); // HTTP/1.1
            header('Pragma: no-cache');
        }
    }

So, it can't modify the header .. but that doesn't explain why its printing the PNG to the screen. Very odd.

bradgrafelman

Check for empty space (line breaks, a simple space, etc.) before and after ANY and ALL <?PHP ?> tags.

Weedpacket

Originally posted by jon3k
Line 10 is just the beginning of block of php code, its actually just "<?php" in my graph.php

So what is on lines 1-9?

Now, a search on the error message would have turned up information on the issue, so that people wouldn't waste their time asking a question for which an answer had already been provided. For example,
http://www.phpbuilder.com/board/showthread.php?s=&postid=10453971#post10453971
http://www.phpbuilder.com/board/showthread.php?s=&threadid=10240608

jon3k

Lines 1-9 are HTML.

I'm really not concerned with the header problem. I'm just interested in why it appears to be just printing the png right into the document.

bradgrafelman

Lines 1-9 are HTML.

You can't output HTML, and then an image at the same time! Get rid of the HTML.

I'm really not concerned with the header problem

Header's tell the browser what to do. Without a header, the browser doesn't know you're sending an image, so it just outputs plain text. So if you're not concerned with the headers, then that must mean you'd rather see the binary text of the image...

jon3k

Originally posted by bradgrafelman
You can't output HTML, and then an image at the same time! Get rid of the HTML.

Header's tell the browser what to do. Without a header, the browser doesn't know you're sending an image, so it just outputs plain text. So if you're not concerned with the headers, then that must mean you'd rather see the binary text of the image...

Binary text? Contradiction much?

bradgrafelman

OI! Quiet you, I don't know why I said binary. '0100110' is hardly text... you know what I meant :/