PHP upload and resize image

Question

I am working on a script that uploads a picture using PHP and I wanna make it resize the image to width 180 before saving it.
I tried using the WideImage library and ->saveFileTO(...) but when I include the WideImage.php in the page, the page goes blank !!
So here is my script if you can help me and tell me how to make it save the resized version

Answer 1

You can use the PHP GD library to resize an image on upload.

The following code should give you an idea of how to implement the resize:

// Get the image info from the photo
$image_info = getimagesize($photo);
$width = $new_width = $image_info[0];
$height = $new_height = $image_info[1];
$type = $image_info[2];

// Load the image
switch ($type)
{
    case IMAGETYPE_JPEG:
        $image = imagecreatefromjpeg($photo);
        break;
    case IMAGETYPE_GIF:
        $image = imagecreatefromgif($photo);
        break;
    case IMAGETYPE_PNG:
        $image = imagecreatefrompng($photo);
        break;
    default:
        die('Error loading '.$photo.' - File type '.$type.' not supported');
}

// Create a new, resized image
$new_width = 180;
$new_height = $height / ($width / $new_width);
$new_image = imagecreatetruecolor($new_width, $new_height);
imagecopyresampled($new_image, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);

// Save the new image over the top of the original photo
switch ($type)
{
    case IMAGETYPE_JPEG:
        imagejpeg($new_image, $photo, 100);
        break;
    case IMAGETYPE_GIF:
        imagegif($new_image, $photo);         
        break;
    case IMAGETYPE_PNG:
        imagepng($new_image, $photo);
        break;
    default:
        die('Error saving image: '.$photo);
}

Answer 2

You can use a class I've written for just such a task:

http://code.google.com/p/image2/source/browse/#svn/trunk/includes/classes

<?php

    try
    {
        $image = new Image2($path_to_image);
    }
    catch (NotAnImageException $e)
    {
        printf("FILE PROVIDED IS NOT AN IMAGE, FILE PATH: %s", $path_to_image);
    }

    $image -> resize(array("width" => 180)) -> saveToFile($new_path); // be sure to exclude the extension
    $new_file_location = $image -> getFileLocation(); // this will include the extension for future use