If you want to validate Twitter username using PHP i.e check whether its available for registration or not, this can be easily achieved using CURL. The following function will check whether twitter username exists for registration or if it is already registered.
If you ever wanted to make WordPress change logo on Login page or customize it, this snippet can help you.
If you have noticed, by default the links/logo point to wordpress site in Register/Login pages or in some of the default WordPress themes. Did you ever wonder how can remove WordPress.org link? If yes, then the following snippet of code can help you.
Did you ever want to make WordPress display Blogroll without default heading but could not find a way to do this? Here’s a little snippet that you can copy and paste in your theme to instantly generate a Blogroll without the default heading.