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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.
Line | Code |
---|---|
1587 | * Filter the ORDER BY clause in the SQL for an adjacent post query. |
1588 | * |
1589 | * The dynamic portion of the hook name, `$adjacent`, refers to the type |
1590 | * of adjacency, 'next' or 'previous'. |
1591 | * |
1592 | * @since 2.5.0 |
1593 | * |
1594 | * @param string $order_by The `ORDER BY` clause in the SQL. |
1595 | */ |
1596 | $sort = apply_filters( "get_{$adjacent}_post_sort", "ORDER BY p.post_date $order LIMIT 1" ); |
1597 |
|
1598 | $query = "SELECT p.ID FROM $wpdb->posts AS p $join $where $sort"; |
1599 | $query_key = 'adjacent_post_' . md5( $query ); |
1600 | $result = wp_cache_get( $query_key, 'counts' ); |
1601 | if ( false !== $result ) { |
1602 | if ( $result ) |
1603 | $result = get_post( $result ); |
1604 | return $result; |
1605 | } |