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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 |
|---|---|
| 3421 | if ( !$q['suppress_filters'] ) { |
| 3422 | /** |
| 3423 | * Filter the completed SQL query before sending. |
| 3424 | * |
| 3425 | * @since 2.0.0 |
| 3426 | * |
| 3427 | * @param array $request The complete SQL query. |
| 3428 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3429 | */ |
| 3430 | $this->request = apply_filters_ref_array( 'posts_request', array( $this->request, &$this ) ); |
| 3431 | } |
| 3432 | |
| 3433 | if ( 'ids' == $q['fields'] ) { |
| 3434 | $this->posts = $wpdb->get_col( $this->request ); |
| 3435 | $this->posts = array_map( 'intval', $this->posts ); |
| 3436 | $this->post_count = count( $this->posts ); |
| 3437 | $this->set_found_posts( $q, $limits ); |
| 3438 | |
| 3439 | return $this->posts; |