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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )
apply_filters( "hook_name", "what_to_filter" )
.Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
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940 | if ( $this->query_vars['number'] && ! $this->query_vars['no_found_rows'] ) { |
941 | /** |
942 | * Filters the query used to retrieve found comment count. |
943 | * |
944 | * @since 4.4.0 |
945 | * |
946 | * @param string $found_comments_query SQL query. Default 'SELECT FOUND_ROWS()'. |
947 | * @param WP_Comment_Query $comment_query The `WP_Comment_Query` instance. |
948 | */ |
949 | $found_comments_query = apply_filters( 'found_comments_query', 'SELECT FOUND_ROWS()', $this ); |
950 |
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951 | $this->found_comments = (int) $wpdb->get_var( $found_comments_query ); |
952 | } |
953 | } |
954 |
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955 | /** |
956 | * Fetch descendants for located comments. |
957 | * |
958 | * Instead of calling `get_children()` separately on each child comment, we do a single set of queries to fetch |