create thumbnails on the fly problem

[Steffen]

I have found a tutorial to create thumbnails on the fly. This is the code:

[code]
# Constants
define(IMAGE_BASE, './images');
define(MAX_WIDTH, 200);
define(MAX_HEIGHT, 200);

function show_thumbnail($image, $dirname)
{

# Get image location
$image_path = IMAGE_BASE . "/" . $dirname . "/" . $image;

# Load image
$img = null;
$ext = strtolower(end(explode('.', $image)));
if ($ext == 'jpg' || $ext == 'jpeg') {
    $img = @imagecreatefromjpeg($image_path);
} else if ($ext == 'png') {
    $img = @imagecreatefrompng($image_path);
# Only if your version of GD includes GIF support
} else if ($ext == 'gif') {
    $img = @imagecreatefrompng($image_path);
}

# If an image was successfully loaded, test the image for size
if ($img) {

    # Get image size and scale ratio
    $width = imagesx($img);
    $height = imagesy($img);
    $scale = min(MAX_WIDTH/$width, MAX_HEIGHT/$height);

    # If the image is larger than the max shrink it
    if ($scale < 1) {
        $new_width = floor($scale*$width);
        $new_height = floor($scale*$height);

        # Create a new temporary image
        $tmp_img = imagecreatetruecolor($new_width, $new_height);

        # Copy and resize old image into new image
        imagecopyresized($tmp_img, $img, 0, 0, 0, 0,
                         $new_width, $new_height, $width, $height);
        imagedestroy($img);
        $img = $tmp_img;
    }
}# Create error image if necessary
if (!$img) {
    $img = imagecreate(MAX_WIDTH, MAX_HEIGHT);
    imagecolorallocate($img,0,0,0);
    $c = imagecolorallocate($img,70,70,70);
    imageline($img,0,0,MAX_WIDTH,MAX_HEIGHT,$c2);
    imageline($img,MAX_WIDTH,0,0,MAX_HEIGHT,$c2);
}

# Display the image
header("Content-type: image/jpeg");
imagejpeg($img);

}
[/code]

I have a page of large images, and i want to make thumbnails of them, without creating a new file. Just to decrease the file size.
The problem is, when I try this for one image:
For example:
show_thumbnail("Foto 005.jpg", "test2");

I get this output:
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Warning: Cannot modify header information - headers already sent by (output started at c:\program files\easyphp1-8\www\speelschare\index.php:23) in c:\program files\easyphp1-8\www\speelschare\sources\fotos\test2.php on line 59
ÿØÿàJFIF



ÿþ>CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), default quality ÿÛC    $.' ",#(7),01444'9=82<.342ÿÛC
 2!!22222222222222222222222222222222222222222222222222ÿÀÈÈ
"

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}
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[/quote]

I wanted to put the header on line 1, but the problem is that my page is not only one image, but also html and flash...

Could anyone help me plz?

[zq29]

My suggestion would be to have your script in its own file, and to modify it to accept the image variables via $_GET[]. Then when you want a resized image, you use that file as the image source with the image details appended to the URL. i.e. <img src="imagesize.php?image=test.jpg" alt="Resized Image"/>

[Steffen]

Hm, that seems a great idea!
I will try this immediatly:)
thx:)