Using WordPress ‘previous_post_link()’ PHP function
Displays the previous post link that is adjacent to the current post.
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Using WordPress ‘populate_roles()’ PHP function
Execute WordPress role creation for the various WordPress versions.
Using WordPress ‘plugins_api()’ PHP function
Retrieves plugin installer pages from the WordPress.org Plugins API.
Using WordPress ‘permalink_link()’ PHP function
Print the permalink of the current post in the loop.