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Displays the numeric ID of the current post. This tag must be within The Loop.
<?php the_ID(); ?>
<p>Post Number: <?php the_ID(); ?></p>
Provides a unique anchor identifier to each post:
<h3 id="post-<?php the_ID(); ?>"><?php the_title(); ?></h3>
Note: In XHTML, the id attribute must not start with a digit. Since the_ID returns the post ID as numerical data, you should include at least one alphabetical character before using it in an id attribute, as in the example above.
This tag has no parameters.
the_ID, the_title, the_title_attribute, single_post_title, the_title_rss, the_content, the_content_rss, the_excerpt, the_excerpt_rss, previous_post_link, next_post_link, posts_nav_link, the_meta,