Add body class to WordPress posts without featured image
You might need to apply different styling to posts without a featured image, this function will add a class to the body tag to all single posts without a featured image:
Executing PHP code in a text widget
Written by admin
Sometimes you might have the need to execute PHP code in a text widget, for instance when linking to pages using bloginfo(‘url’); This function will enable the execution of PHP in text widgets: Code is courtesy of Emanuele Feronato