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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 |
|---|---|
| 2998 | * Splitting the query will cause it to fetch just the IDs of the found posts |
| 2999 | * (and then individually fetch each post by ID), rather than fetching every |
| 3000 | * complete row at once. One massive result vs. many small results. |
| 3001 | * |
| 3002 | * @since 3.4.0 |
| 3003 | * |
| 3004 | * @param bool $split_the_query Whether or not to split the query. |
| 3005 | * @param WP_Query $query The WP_Query instance. |
| 3006 | */ |
| 3007 | $split_the_query = apply_filters( 'split_the_query', $split_the_query, $this ); |
| 3008 | |
| 3009 | if ( $split_the_query ) { |
| 3010 | // First get the IDs and then fill in the objects. |
| 3011 | |
| 3012 | $this->request = "SELECT $found_rows $distinct {$wpdb->posts}.ID FROM {$wpdb->posts} $join WHERE 1=1 $where $groupby $orderby $limits"; |
| 3013 | |
| 3014 | /** |
| 3015 | * Filters the Post IDs SQL request before sending. |
| 3016 | * |