Scale Image Using PHP and Maintaining Aspect Ratio

Question

Basically I want to upload an image (which i\'ve sorted) and scale it down to certain constraints such as max width and height but maintain the aspect ratio of the original

Answer 1

Here is a comprehensive application that I worked hard on it to include most common operations like scale up & scale down, thumbnail, preserve aspect ratio, convert file type, change quality/file size and more...

 $old_y){
        $new_x    =   $newWidth;
        $new_y    =   $old_y / $old_x * $newWidth;
    } elseif($old_x < $old_y){
        $new_y    =   $newHeight;
        $new_x    =   $old_x / $old_y * $newHeight;
    } elseif($old_x == $old_y){
        $new_x    =   $newWidth;
        $new_y    =   $newHeight;
    }
} elseif ($newWidth){
    $new_x    =   $newWidth;
    $new_y    =   $old_y / $old_x * $newWidth;
} elseif ($newHeight){
    $new_y    =   $newHeight;
    $new_x    =   $old_x / $old_y * $newHeight;
} else {
    $new_x    =   $old_x;
    $new_y    =   $old_y;
}

$dst_img = ImageCreateTrueColor($new_x, $new_y);

if ($palette_8bit){//////// Reduce to 8bit - 256 colors ////////
    $transparent = imagecolorallocatealpha($dst_img, 255, 255, 255, 127); 
    imagecolortransparent($dst_img, $transparent);
    imagefill($dst_img, 0, 0, $transparent);
    imagecopyresampled($dst_img,$src_img,0,0,0,0,$new_x,$new_y,$old_x,$old_y);// Great quality resize.
    imagetruecolortopalette($dst_img, false, 255);
    imagesavealpha($dst_img, true);
} else {
    // Check image and set transparent for png or white background for jpg
    if ($dst_type == 'png'){
        imagealphablending($dst_img, false);
        imagesavealpha($dst_img, true);
        $transparent = imagecolorallocatealpha($dst_img, 255, 255, 255, 127);
        imagefilledrectangle($dst_img, 0, 0, $new_x, $new_y, $transparent);
    } elseif ($dst_type == 'jpg'){
        $white = imagecolorallocate($dst_img, 255, 255, 255);
        imagefilledrectangle($dst_img, 0, 0, $new_x, $new_y, $white);
    }

    imagecopyresampled($dst_img,$src_img,0,0,0,0,$new_x,$new_y,$old_x,$old_y);// Great quality resize.
}

// Skip the save to parameter using NULL, then set the quality; imagejpeg($dst_img);=> Default quality
if ($dst_file){
    if ($dst_type == 'png'){
        imagepng($dst_img, $dst_file, $quality);
    } elseif ($dst_type == 'jpg'){
        imagejpeg($dst_img, $dst_file, $quality);
    }
} else {
    header('Content-Disposition: Attachment;filename=' . $dst_name . '.' . $dst_type);// comment this line to show image in browser instead of download
    header('Content-type: ' . $dst_content);
    if ($dst_type == 'png'){
        imagepng($dst_img, NULL, $quality);
    } elseif ($dst_type == 'jpg'){
        imagejpeg($dst_img, NULL, $quality);
    }
}
imagedestroy($src_img);
imagedestroy($dst_img);
//##// END : Resize image (Scale Up & Down) (thumbnail, bigger image, preserve aspect ratio) END //##//