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Comment Queries

You can retrieve comments using the WP_Comment_Query class. When WordPress tries to load a single post, it constructs one of these objects in order to retrieve the number of comments it has, ready for when it's displayed later on.
This is a basic comment query:
$args = array(
// args here
// The Query
$comments_query = new WP_Comment_Query();
$comments = $comments_query->query( $args );
// Comment Loop
if ( $comments ) {
foreach ( $comments as $comment ) {
echo '<p>' . $comment->comment_content . '</p>';
} else {
echo 'No comments found.';
Comment queries can find comments of different types across multiple or single posts. Using a comment query can be faster than a raw SQL command thanks to the built cache system.