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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 |
|---|---|
| 3418 | * Splitting the query will cause it to fetch just the IDs of the found posts |
| 3419 | * (and then individually fetch each post by ID), rather than fetching every |
| 3420 | * complete row at once. One massive result vs. many small results. |
| 3421 | * |
| 3422 | * @since 3.4.0 |
| 3423 | * |
| 3424 | * @param bool $split_the_query Whether or not to split the query. |
| 3425 | * @param WP_Query $this The WP_Query instance. |
| 3426 | */ |
| 3427 | $split_the_query = apply_filters( 'split_the_query', $split_the_query, $this ); |
| 3428 | |
| 3429 | if ( $split_the_query ) { |
| 3430 | // First get the IDs and then fill in the objects |
| 3431 | |
| 3432 | $this->request = "SELECT $found_rows $distinct $wpdb->posts.ID FROM $wpdb->posts $join WHERE 1=1 $where $groupby $orderby $limits"; |
| 3433 | |
| 3434 | /** |
| 3435 | * Filter the Post IDs SQL request before sending. |
| 3436 | * |