Resizing images

[whitchman]

can anyone show me a really simple way to resize an image with php. Like if I just want to make the width of any given image 100 pixels. I just need a starting point do I can teach myself the rest. Thanks.

[barand]

Here's a sample of resizing code

            $size = getimagesize($src)
            list($width, $height, $type, $attr) = $size;

        $img = imagecreatefromjpeg($src);

        $thumbh = $height * $thumbw/$width;

        $tmp = imagecreatetruecolor($thumbw, $thumbh);
        imagecopyresized($tmp, $img, 0, 0, 0, 0, $thumbw, $thumbh, $width, $height);

        if (file_exists($newName))
            unlink($newName);
        imagejpeg($tmp, $newName);  // creates thumb file

        imagedestroy($tmp);
        imagedestroy($img);

hth

[whitchman]

could you explain this script a little. It looks like there's a bunch of variables that aren't declared.

[whitchman]

Everytime I try this image creation stuff I get an error like this:

Fatal error: Call to undefined function: imagecreatefromjpeg()

[barand]

Sorry about that - I extracted from middle of a script.

$src = filename of original jpg
$thumbw, $thumbh = width and height of reized thumbnail image
$newName = filename of the created thumbnail jpg.

If you get undefined functions it will be because your GD extension isn't loaded.
Make sure the line in extensions section of php.ini is uncommented and the php_gd
lib is in your specified extensions director

[whitchman]

ok if I just have the original php setup do I need to download some extension? or does it come with the standard distribution? (windows)

[The_Chancer]

Standard installation of the PHP for windows includes this.

Uncomment the php_gd2.dll extension line in the php.ini - for more information look at the http://www.php.net/gd page