WordPress Themes are files that work together to create the design and functionality of a WordPress site. Each Theme may be different, offering many choices for site owners to instantly change their website look but they are made up with simply following functions.
the_title()Displays the posts/pages title
the_content()Displays the content of the post/page
the_excerpt()Displays the excerpt of the current post/page
the_time()Displays the time of the current post/page
the_date()Displays the date of a post or set of post/page
the_permalink()Displays the URL for the permalink
the_category()Displays the category of a post
the_author();Displays the author of the post
the_ID();Displays the numeric ID of the current post
wp_list_pages();Displays all the pages
wp_tag_cloud();Displays a tag cloud
wp_list_cats();Displays the categories
get_calendar();Displays the calendar
wp_get_archives()Displays a date-based archives list
posts_nav_link();Displays Previous page and Next Page links
next_post_link()Displays Newer Posts link
previous_post_link()Displays previous link
edit_post_link(__('Edit Post'));
Displays the edit link
the_search_query();?>Value for search form
wp_register();?>Displays the register link
wp_loginout();?>Displays the log in/out link
wp_meta();?>Meta for administrators
timer_stop(1);?>Time to load the page
echo c2c_custom('test');?>
Displays the custom field
get_links_list();Display links from Blogroll
get_calendar();Displays the built-in calendar
comments_popup_link();Link of the posts comments