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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 |
|---|---|
| 2920 | * passed to the filter by reference. If WP_Query does not perform a database |
| 2921 | * query, it will not have enough information to generate these values itself. |
| 2922 | * |
| 2923 | * @since 4.6.0 |
| 2924 | * |
| 2925 | * @param array|null $posts Return an array of post data to short-circuit WP's query, |
| 2926 | * or null to allow WP to run its normal queries. |
| 2927 | * @param WP_Query $this The WP_Query instance (passed by reference). |
| 2928 | */ |
| 2929 | $this->posts = apply_filters_ref_array( 'posts_pre_query', array( null, &$this ) ); |
| 2930 | |
| 2931 | if ( 'ids' == $q['fields'] ) { |
| 2932 | if ( null === $this->posts ) { |
| 2933 | $this->posts = $wpdb->get_col( $this->request ); |
| 2934 | } |
| 2935 | |
| 2936 | $this->posts = array_map( 'intval', $this->posts ); |
| 2937 | $this->post_count = count( $this->posts ); |
| 2938 | $this->set_found_posts( $q, $limits ); |