Add function to add element on all page

Question

I would like to add a function to add for example a link in the top and in the bottom of all my pages. The best would be to create a plugin in order to activate or disable it.

Thank you so much.

Answer 1

To do this you have to create a function in your plugin. To have it display only to logged in users use:

   if (is_user_logged_in()) {

then use the wp_head and wp_footer links to add actions to display the link you want, ie:

 add_action('wp_head','your_function');
 add_action('wp_footer', 'your_function');