[Resolved] PHP Gif Image Output Errors

[bpat1434]

Hey guys.

I'm using a class that I found online that works on other sites. Here is the class.
Example

Okay, so using that class, I follow his tutorial and I my code works fine. No problems. I debug it, and I get the values I want.

The problem is that it doesn't output a gif, but rather gives me an error that headers have already been sent, but I don't know where or why. Any help would be greatly appreciated.

<?php

@include_once($_SERVER['DOCUMENT_ROOT'].'/test_new_version/scripts/config.php');
@require($dir['inc'].'class.phpbargraph.php');

$img = "gif";

if(!class_exists("PhpBarGraph"))
{
	die("There was an error loading the class.");
}

$imageHeight = 150;
$imageWidth = 150;

$image = imageCreateTrueColor($imageWidth, $imageHeight);

$backgroundColor = ImageColorAllocate($image, 248, 248, 248);
$orange = ImageColorAllocate($image, 255, 153, 0);
$ltblue = ImageColorAllocate($image, 0, 153, 204);

ImageFill($image, 0, 0, $backgroundColor);

Imageinterlace($image, 1);

$statGraph = new PhpBarGraph;
$statGraph->SetX(10);
$statGraph->SetY(10);
$statGraph->SetWidth($imageWidth-20);
$statGraph->SetHeight($imageHeight-20);
$statGraph->SetNumOfValueTicks(0);

$statGraph->SetShowLabels(TRUE);  

// The default is true. 
// Setting this to false will cause phpBarGraph to not print the labels of each bar.

$statGraph->SetShowValues(TRUE);  

// The default is true. 
// Setting this to false will cause phpBarGraph to not print the values of each bar.

$statGraph->SetBarBorder(TRUE);   

// The default is true. 
// Setting this to false will cause phpBarGraph to not print the border of each bar.

$statGraph->SetShowFade(TRUE);    

// The default is true. 
// Setting this to false will cause phpBarGraph to not print each bar as a gradient.

$statGraph->SetShowOuterBox(TRUE);   

// The default is true. 
// Setting this to false will cause phpBarGraph to not print the outside box.

$statGraph->SetBarSpacing(20);     

// The default is 10. 
// This changes the space inbetween each bar.

$sql = "SELECT * FROM `statistics_test` ORDER BY id ASC";
$result = mysql_query($sql);
while($row = mysql_fetch_array($result))
{
	$statGraph->AddValue($row['Month'], $row['Number']);
}

$statGraph->SetStartBarColor("ffcc00");
$statGraph->SetEndBarColor("990000");

$statGraph->SetLineColor("000000");

$statGraph->DrawBarGraph($image);

// Uncomment to turn debug on.
// $statGraph->DebugPrint();

if($img == "png")
{
	header("Content-type: image/png");
	ImagePNG($image);
}
elseif($img == "gif")
{
	header("Content-type: image/gif");
	ImageGif($image);
}

Imagedestroy($image);
?>

~Brett

[justsomeone]

The code you've shown doesn't explicitly send any headers. Doublecheck the include files, do they send any content before the headers are sent?

If there are no headers being sent from anywhere, watch out for any stray text - including white space. My pet peeve in this area is if there is a blank line or space before the "<?" tag anywhere? This would cause your server to assume the page is text and to send the appropriate headers automatically.

I've also heard some battle-scarred php warriors swear that white space INSIDE the "<?... ?>" tags has caused them this problem and that deleting a seemingly random blank line in the code resolved the issue, but I'm a bit sceptical of that and have never witnessed it myself.

[bpat1434]

Stupid trailing white-space after the closing PHP tag. . .

Thanks for pointing it out to me.

~Brett