Basically I want a custom widget to show only inside the post details view page. The concept is that I want to first check the category of the post then next if that category is matched that what I want, it will show that above mentioned custom widget in the sidebar. That widget will be dynamic in nature in the sense that when I wish to show the details of that post the widget will come in that post details page and will hold some data from that post, suppose to say feature image of the post and custom field values of that post. Please give me some solution.
<?php the_widget( $widget ); ?>
add this anywhere in your template $widget is name of your widget