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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 |
|---|---|
| 3214 | * Splitting the query will cause it to fetch just the IDs of the found posts |
| 3215 | * (and then individually fetch each post by ID), rather than fetching every |
| 3216 | * complete row at once. One massive result vs. many small results. |
| 3217 | * |
| 3218 | * @since 3.4.0 |
| 3219 | * |
| 3220 | * @param bool $split_the_query Whether or not to split the query. |
| 3221 | * @param WP_Query $query The WP_Query instance. |
| 3222 | */ |
| 3223 | $split_the_query = apply_filters( 'split_the_query', $split_the_query, $this ); |
| 3224 | |
| 3225 | if ( $split_the_query ) { |
| 3226 | // First get the IDs and then fill in the objects. |
| 3227 | |
| 3228 | $this->request = " |
| 3229 | SELECT $found_rows $distinct {$wpdb->posts}.ID |
| 3230 | FROM {$wpdb->posts} $join |
| 3231 | WHERE 1=1 $where |
| 3232 | $groupby |