It is usually happen when blog admin left a comment on his blog,WordPress use the name in the comment css class.

This is useful for styling, but it will also let people know about your admin login name and is no more secure. To avoid and hide this information, you can add this code snippet that can quickly remove the offending class from every comment.

Just add this to your functions.php file:

Source : bavotasan

It is possible to make redirect mode permanent active, by setting example.com as your primary domain, all your visitors who try to access your old example.wordpress.com links automatically get redirected to the new domain.

While starting WordPress.com, you have to start with a standard WordPress.com domain name for your blog which looks something like this: – example.wordpress.com. There you can find the option of upgrading to a custom mapped domain such as example.com.

The good news is by setting example.com as your primary domain, all your visitors who try to access your old example.wordpress.com links automatically get redirected to the new domain.

But what about search engines and other services that access the old example.wordpress.com links?

Up until now, WordPress.com would send those services a 302 redirect which would tell them that a link had a new temporary home, and to go index that new link, but to not forget about the original one.

Today we have changed 302 redirects to 301 redirects. A 301 redirect tells search engines the new link has moved permanently, and they can discard the old links.

Why does this matter?

This change should help maintain traffic levels from search engines when changing or upgrading to custom domains, and makes things more flexible for you if you ever want to move from WordPress.com to self-hosted WordPress.

As with anything search engine related, your mileage may vary, and the timing on when search engines such as Google, Bing, and others update their index is not something anyone can predict. We have a short support document explaining some of the complexities involved with search engines that is worth a read if you have any questions.

Helpful Links:

http://en.wikipedia.org/wiki/HTTP_302

http://en.wikipedia.org/wiki/HTTP_301

http://en.support.wordpress.com/domain-mapping/

http://get.wp.com/

http://en.support.wordpress.com/search-engines/

This script will replace the uploaded image (if bigger than the larger size defined in your settings) by the large image generated by WordPress to save space in your server, and save bandwidth if you link a thumbnail to the original image, like when a lightbox plugin is used.

Simply paste the following code on your functions.php file and save it. No other action is needed!

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');

WordPress is a great CMS, but implementing some features within your theme can require a little lateral thinking. The content for your page or post is usually output by the theme code using a single function call:

the_content(args);

But what if you need to split the content into two or more blocks? That might be necessary if your theme requires multiple columns or sections on the page. WordPress provides a get_the_content() function to return content as a PHP variable, but how do you determine where the divisions occur? There are a few solutions on the web, but most involve either:

1. Splitting the content at HTML tags such as h2 headings. Unfortunately, that requires the content author to know a little HTML and it’s not very versatile — you couldn’t allow two headings in one column.
2. Using a WordPress shortcode. That’s more flexible, but it still puts the onus on the content editor to remember and use the right code.

The WordPress <!--more--> tag may offer a better solution. It’s normally used to split a long article into two or more pages, but not all themes use that facility and it only works for WordPress posts by default (not pages). Using the <!--more--> tag offers several advantages:

• A “more” toolbar button is available in both the visual and HTML editing pane.
• Divisions can be placed anywhere in the content.
• It’s easy for non-technical users to understand how the content will be split.

To split your content, locate your theme folder (wp-content/themes), edit or create a functions.php file and add the following function within a <?php … ?> block: