Resize Image

<?php
    /*
        ImageThumb - Creates a thumbnail image from another based on specified sizes
        
        SourceImage - The location of the image in which you want to resize
        DestImage - The location to save the thumb, use null if you want to just display to browser
        Width - The resized width of the image
        Height - The resized height of the image
        Type - The image type in which you want to save
        
        Note: The thumb is resized while keeping the aspect ratio, so width and height are not the
        absolute width and height.
    */
 
    function ImageThumb($sourceImage, $destImage, $width, $height, $type = "png") {
        $type = strtolower($type);
        $imageSize = getimagesize($sourceImage);
 
        if($imageSize[0] > $imageSize[1]) {
            $newWidth = $width;
            $newHeight = $imageSize[1] * ($newWidth / $imageSize[0]);
        }
        else {
            $newHeight = $height;
            $newWidth = $imageSize[0] * ($newHeight / $imageSize[1]);
        }
 
        switch(image_type_to_mime_type($imageSize[2])) {
            case "image/jpeg":
                $image = imagecreatefromjpeg($sourceImage);
                break;
            case "image/gif":
                $image = imagecreatefromgif($sourceImage);
                break;
            case "image/png":
                $image = imagecreatefrompng($sourceImage);
                break;
            default:
                $t = image_type_to_mime_type($imageSize[2]);
                echo "The file type {$t} is not supported, please use either jpeg, gif, or png";
                break;
        }
 
        $thumb = imagecreatetruecolor($newWidth, $newHeight);
        imagecopyresampled($thumb, $image, 0, 0, 0, 0, $newWidth, $newHeight, $imageSize[0], $imageSize[1]);
 
        switch($type) {
            case "jpg":
            case "jpeg":
                header("Content-type: image/jpeg");
                imagejpeg($thumb, $destImage);
                break;
            case "gif":
                header("Content-type: image/gif");
                imagegif($thumb, $destImage);
                break;
            case "png":
                header("Content-type: image/png");
                imagepng($thumb, $destImage);
                break;
            default:
                echo "The image type {$type} is not supported, please choose another.";
                break;
        }
 
        imagedestroy($image);
        imagedestroy($thumb);
    }
?>