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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 |
|---|---|
| 5349 | /** |
| 5350 | * Filter the capability to read private posts for a custom post type |
| 5351 | * when generating SQL for getting posts by author. |
| 5352 | * |
| 5353 | * @since 2.2.0 |
| 5354 | * @deprecated 3.2.0 The hook transitioned from "somewhat useless" to "totally useless". |
| 5355 | * |
| 5356 | * @param string $cap Capability. |
| 5357 | */ |
| 5358 | if ( ! $cap = apply_filters( 'pub_priv_sql_capability', '' ) ) { |
| 5359 | $cap = $post_type_obj->cap->read_private_posts; |
| 5360 | } |
| 5361 | |
| 5362 | $sql = $wpdb->prepare( 'post_type = %s', $post_type ); |
| 5363 | |
| 5364 | if ( null !== $post_author ) { |
| 5365 | $sql .= $wpdb->prepare( ' AND post_author = %d', $post_author ); |
| 5366 | } |
| 5367 | |