Right now, many blogger uses WordPress for their Publishing platform, I will give some tips how to save space on your WordPress blog server. We will added little bit php code in our functions.php theme files. This code is Automatically uses resized images instead the originals size.

Write code to Automatically uses resized images insteaad the originals below

function replace_uploaded_image($image_data) {
    // if there is no large image : return
    if (!isset($image_data['sizes']['large'])) return $image_data;

    // paths to the uploaded image and the large image
    $upload_dir = wp_upload_dir();
    $uploaded_image_location = $upload_dir['basedir'] . '/' .$image_data['file'];
    $large_image_location = $upload_dir['path'] . '/'.$image_data['sizes']['large']['file'];

    // delete the uploaded image
    unlink($uploaded_image_location);

    // rename the large image
    rename($large_image_location,$uploaded_image_location);

    // update image metadata and return them
    $image_data['width'] = $image_data['sizes']['large']['width'];
    $image_data['height'] = $image_data['sizes']['large']['height'];
    unset($image_data['sizes']['large']);

    return $image_data;
}
add_filter('wp_generate_attachment_metadata','replace_uploaded_image');

This code is doing automatically, so you didn’t needed any command anymore. Thanks for Serge Rauber for tricks about Save Space in WordPress blog server.