PHPApp/image.php

<?
$config_dircache="images/cache/";
# Constants
if(isset($_GET['w']))
    $maxwidth = $_GET['w'];

if(isset($_GET['h']))
    $maxheight = $_GET['h'];

# Get image location
if(isset($_GET['src'])){
    $image_path = str_replace(" ", "%20", $_GET['src']);
    
    # Load image
    $img = null;
    $ext = strtolower(end(explode('.', $image_path)));

    $filename_cache = md5(md5_file($image_path).md5($maxwidth."x".$maxheight));

    if(!file_exists($config_dircache.$filename_cache.'.'.$ext)){

        if($ext == 'jpg' || $ext == 'jpeg')
            $img = @imagecreatefromjpeg($image_path);
        else if($ext == 'png')
            $img = @imagecreatefrompng($image_path);
        else if($ext == 'gif')
            $img = @imagecreatefromgif($image_path);
        
        # If an image was successfully loaded, test the image for size
        if($img){

            # Get image size and scale ratio
            $width = imagesx($img);
            $height = imagesy($img);
            
            if($width>$height){
                $new_width=$maxwidth;
                $new_height = round(($maxwidth*$height)/$width);
                if($new_height>$maxheight) {
                    $new_width=round(($maxheight*$width)/$height);
                    $new_height=$maxheight;
                }
            }
            elseif($height>$width){
                $new_width = round(($maxheight*$width)/$height);
                $new_height = $maxheight;
                if($new_width>$maxwidth) {
                    $new_width = $maxwidth;
                    $new_height = round(($maxwidth*$height)/$width);
                }
            }
            else{
                if($maxwidth>$maxheight) {
                    $new_width = round(($maxheight*$width)/$height);
                    $new_height = $maxheight;
                }
                elseif($maxheight>$maxwidth) {
                    $new_width = $maxwidth;
                    $new_height = round(($maxwidth*$height)/$width);
                }
                else{ // sono uguali
                    $new_width = $new_height = $maxwidth;
                }
            }
            
            # Create a new temporary image
            if($ext=='jpg' || $ext=='jpeg'){
                $tmp_img = imagecreatetruecolor($new_width, $new_height);
                imagecopyresampled($tmp_img, $img, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
            }
            else if($ext=='png'){
                $tmp_img = imagecreatetruecolor($new_width, $new_height);
                imagecopyresampled($tmp_img, $img, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
                /* $color_transparent = imagecolortransparent($img);    //codice per la gestione delle trasparenze
                $tmp_img = imagecreate($new_width, $new_height);
                imagepalettecopy($tmp_img, $img);
                imagefill($tmp_img, 0, 0, $color_transparent);
                imagecolortransparent($tmp_img, $color_transparent);
                imagecopyresampled($tmp_img, $img, 0, 0, 0, 0, $new_width, $new_height, $width, $height); */
            }
            else if($ext=='gif'){
                $color_transparent = imagecolortransparent($img);
                $tmp_img = imagecreate($new_width, $new_height);
                imagepalettecopy($tmp_img, $img);
                imagefill($tmp_img, 0, 0, $color_transparent);
                imagecolortransparent($tmp_img, $color_transparent);
                imagecopyresampled($tmp_img, $img, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
            }

            # Copy and resize old image into new image
            $img = $tmp_img;
        }
        
        if ($ext=='jpg' || $ext=='jpeg'){
            header("Content-type: image/jpeg");
            //imagejpeg($img, $config_dircache.$filename_cache.'.'.$ext, 100);
            imagejpeg($img);
            imagedestroy($img);
        }
        else if ($ext=='png'){
            header("Content-type: image/png");
            //imagepng($img, $config_dircache.$filename_cache.'.'.$ext);
            imagepng($img);
            imagedestroy($img);
        }
        else if ($ext=='gif') {
            header("Content-type: image/gif");
            //imagegif($img, $config_dircache.$filename_cache.'.'.$ext);
            imagegif($img);
            imagedestroy($img);
        }
        else{/*/*Messaggio di errore. Impossibile visualizzare l'immagine.*/}
    }

    if ($ext == 'jpg' || $ext == 'jpeg')
        $img = @imagecreatefromjpeg($config_dircache.$filename_cache.'.'.$ext);
    else if ($ext == 'png')
        $img = @imagecreatefrompng($config_dircache.$filename_cache.'.'.$ext);
    else if ($ext == 'gif')
        $img = @imagecreatefromgif($config_dircache.$filename_cache.'.'.$ext);
    
    if ($ext == 'jpg' || $ext == 'jpeg'){
        header("Content-type: image/jpeg");
        imagejpeg($img, '', 95);
        imagedestroy($img);
    }
    else{
        if($ext=='png'){
            header("Content-type: image/png");
            imagepng($img);
            imagedestroy($img);
        }
        else{
            if($ext=='gif'){
                header("Content-type: image/gif");
                imagegif($img);
                imagedestroy($img);
            }
            else {/*Messaggio di errore. Impossibile visualizzare l'immagine.*/}
        }
    }
}
?>