Resize uploaded image

I'm using this script for multiple image upload, but I want to resize each images uploaded through the form so that the maximum height and width should be 500px, without loosing the proportions. Here is the script:

while(list($key,$value) = each($_FILES['images']['name']))

		{

			if(!empty($value))

			{

				$filename = $value;

					$filename=str_replace(" ","_",$filename);// Add _ inplace of blank space in file name, you can remove this line



					while(file_exists('upimg/'.$filename))

  $filename=rand(1,9999).$filename;

$add = "upimg/$filename";  

                       //echo $_FILES['images']['type'][$key];

			     // echo "<br>";

					copy($_FILES['images']['tmp_name'][$key], $add);

					chmod("$add",0777);

			}

PHP:

Can anyone please help?

Thanks in advance

 

Is there a certain format you want for the final image? Here's the function I usually use for PNGs:

function createpng($src,$dest,$width=800,$height=800){
	$data=@getimagesize($src);
    $img=@imagecreatefromstring(file_get_contents($src));
    if(!$img)
        return false;
    $sw=imagesx($img);
    $sh=imagesy($img);
    if($sw<$width&&$sh<$height){
        $w=$sw;
        $h=$sh;
    }elseif($sw>$sh){
        $w=$width;
        $h=floor(($sh*($height/$sw)));
    }elseif($sw<$sh){
        $w=floor($sw*($width/$sh));
        $h=$height;
    }elseif($sw==$sh){
        $w=$width;
        $h=$height;
    }
    $w=($w<1)?1:$w;
    $h=($h<1)?1:$h;
    $thumb=@imagecreatetruecolor($w,$h);
	if($data['mime']=="image/png"){
		imagealphablending($thumb,false);
		imagefill($thumb,0,0,imagecolorallocatealpha($thumb,0,0,0,127));
		imagesavealpha($thumb,true);
	}elseif($data['mime']=="image/gif"){
		$transparent=imagecolortransparent($img);
		if($transparent>=0){
			$tcolor=imagecolorsforindex($img,$transparent);
			$transparent=imagecolorallocate($thumb,$tcolor['red'],$tcolor['green'],$tcolor['blue']);
			imagefill($thumb,0,0,$transparent);
			imagecolortransparent($thumb,$transparent);
		}
	}
    imagecopyresampled($thumb,$img,0,0,0,0,$w,$h,$sw,$sh);
	imagepng($thumb,$dest);
    imagedestroy($thumb);
    imagedestroy($img);
    return true;
}

PHP:

Call the function using createpng($source,$destination,500,500) where $source is the location of the uploaded image, such as $_FILES['images']['tmp_name'], and $destination is where you want to save it.

 

Perhaps this class will help you out: http://www.kavoir.com/2009/01/php-resize-image-and-store-to-file.html