[code=php]
<?php
/**
* ResizeImage
* @desc A function to easily resize images
*
* @author Koen <koen@sitemasters.be>
* @version 1.2
*
* @param string $sImage The image you would like to have resized
* @param int $iMaxWidth The maximum width [Optional, default: 600]
* @param int $iMaxHeight The maximum height [Optional, default: 600]
*
* @return False on failure, Array(name, mime, width, height) on succeed.
*
*
* Changelog:
* 10-01-2009
* Added support for "image/pjepg" mime type. (Internet Explorer uses this.)
* 24-01-2009
* Fastened script.
*/

function ResizeImage($sImage, $iMaxWidth=600, $iMaxHeight=600) 
{
	if($aSize = @getimagesize($sImage)) 
	{
		list($iOrigWidth, $iOrigHeight) = $aSize;
		$sMimeType = $aSize['mime'];
		$rResized = null;
		switch($sMimeType) 
		{
			case 'image/jpeg':
			case 'image/pjpeg':
			case 'image/jpg':
				$rResized = imagecreatefromjpeg($sImage);
				break;
			case 'image/gif':
				$rResized = imagecreatefromgif($sImage);
				break;
			case 'image/png':
			case 'image/x-png':
				$rResized = imagecreatefrompng($sImage);
				break;
			default:
				return false;
		}
		if(isset($iOrigWidth, $iOrigHeight)) 
		{
			if($iOrigWidth <= $iMaxWidth && $iOrigHeight <= $iMaxHeight) 
			{
				$iNewWidth = $iOrigWidth;
				$iNewHeight = $iOrigHeight;
			} else 
			{
				$iOrigRatio = $iOrigWidth / $iOrigHeight;
				if(($iMaxWidth/$iMaxHeight) > $iOrigRatio) 
				{
					$iNewWidth = $iMaxHeight * $iOrigRatio;
					$iNewHeight = $iMaxHeight;
				} else 
				{
					$iNewHeight = $iMaxWidth / $iOrigRatio;
					$iNewWidth = $iMaxWidth;
				}
			}
			$rResampledImage = imagecreatetruecolor($iNewWidth, $iNewHeight);			
			imagecopyresampled($rResampledImage, $rResized, 0, 0, 0, 0, $iNewWidth, $iNewHeight, $iOrigWidth, $iOrigHeight);
			unlink($sImage);
			switch($sMimeType) 
			{
				case 'image/jpeg':
				case 'image/pjpeg':
				case 'image/jpg':
					imagejpeg($rResampledImage, $sImage, 100);					
					break;
				case 'image/gif':
					imagegif($rResampledImage, $sImage);	
					break;
				case 'image/png':
				case 'image/x-png':
					imagepng($rResampledImage, $sImage);	
					break;
				default:
					return false;					
			}
			@chmod($sImage, 0777);
			return array(	"name" => $sImage,
					"mime" => $sMimeType,
					"width" => $iNewWidth,
					"height" => $iNewHeight
					);
		} else 
		{
			return false;
		}
	} else 
	{
		return false;		
	}
}

// Voorbeeld:

echo '<pre>', print_r(resize('picture.png')), '</pre>';

// Return Value:

Array
(
    [name] => picture.png
    [mime] => image/png
    [width] => 436
    [height] => 600
)

?>