PHP GD Resize Image

I already have an image uploading script that checks for lots of things like dupes of folders the images are placed in or even the image names them self's.

Hell I even check the images width and height to run a condition if either width and height exceed 500px.

In this condition.. all I want to do is if the image in either width or height exceeds 500px to resize either width or height while keeping the images ratio.

You think I am asking for the freaking moon here folks, everything out on the net is trying to show me how to weave a mess of uploading and resizing with thumbnails when all I need is to resize my original image and overwrite it. I don't need stupid thumbnails and I CERTAINLY don't need to be shown how to upload images OVER AND OVER AND OVER AND OVER again.

Please, anyone, a simple resize demo is all I need that will overwrite it original source image...

Are all the images the same type, and what is the type .jpg, .gif?

allowed image types are 'jpg','gif' and 'png'

No idea if this is helpful for you, but just incase. :) The vars you supply to the function should be fairly self explanatory. :D Easy enough to strip down if you want to minimise the code too.


function image_resize($input, $width, $height, $delete = false)
{
list($currwidth, $currheight, $type) = @getimagesize($input);

if (empty($currwidth) || empty($currheight) || $type > '3')
{
return false;
}

$ratio = $currwidth/$currheight;

if ($currwidth < $width && $currheight < $height)
{
if (is_file($input))
{
@copy($input, $input.'_new');
return $input.'_new';
}
else
{
return false;
}
}
else
{
$output = $input.time();

if ($width/$height > $ratio)
{
$width = $height*$ratio;
}
else
{
$height = $width/$ratio;
}

$zwidth = $width;
$zheight = $height;

$dimg = imagecreatetruecolor($zwidth, $zheight);
$background = imagecolorallocate($dimg, 255, 255, 255);
imagefill($dimg, 0, 0, $background);

if ($type == '1')
{
$simg = imagecreatefromgif($input);
imagecopyresampled($dimg, $simg, 0, 0, 0, 0, $zwidth, $zheight, $currwidth, $currheight);
imagegif($dimg, $output);
}
else if ($type == '2')
{
$simg = imagecreatefromjpeg($input);
imagecopyresampled($dimg, $simg, 0, 0, 0, 0, $zwidth, $zheight, $currwidth, $currheight);
imagejpeg($dimg, $output, 85);
}
else if ($type == '3')
{
$simg = imagecreatefrompng($input);
imagecopyresampled($dimg, $simg, 0, 0, 0, 0, $zwidth, $zheight, $currwidth, $currheight);
imagepng($dimg, $output);
}

@imagedestroy($dimg);
@imagedestroy($simg);

if (is_file($output))
{
if ($delete)
{
unlink($input);
}
return $output;
}
else
{
return false;
}
}
}

If you can bother altering a few lines of code, try the following comprehensive code example:

Resize Images Using PHP and GD Library (http://911-need-code-help.blogspot.com/2008/10/resize-images-using-phpgd-library.html)

The code sample contains a function called "generate_image_thumbnail( )" which accepts source path of an existing image and destination path for the resized image. You can use the above function and specify destination image path = source image path; that should overwrite the original image.