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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 |
|---|---|
| 3030 | * Filters the arguments passed to WP_Query during an Ajax |
| 3031 | * call for querying attachments. |
| 3032 | * |
| 3033 | * @since 3.7.0 |
| 3034 | * |
| 3035 | * @see WP_Query::parse_query() |
| 3036 | * |
| 3037 | * @param array $query An array of query variables. |
| 3038 | */ |
| 3039 | $query = apply_filters( 'ajax_query_attachments_args', $query ); |
| 3040 | $attachments_query = new WP_Query( $query ); |
| 3041 | update_post_parent_caches( $attachments_query->posts ); |
| 3042 | |
| 3043 | $posts = array_map( 'wp_prepare_attachment_for_js', $attachments_query->posts ); |
| 3044 | $posts = array_filter( $posts ); |
| 3045 | $total_posts = $attachments_query->found_posts; |
| 3046 | |
| 3047 | if ( $total_posts < 1 ) { |
| 3048 | // Out-of-bounds, run the query again without LIMIT for total count. |