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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 |
|---|---|
| 5113 | /** |
| 5114 | * Filter the capability to read private posts for a custom post type |
| 5115 | * when generating SQL for getting posts by author. |
| 5116 | * |
| 5117 | * @since 2.2.0 |
| 5118 | * @deprecated 3.2.0 The hook transitioned from "somewhat useless" to "totally useless". |
| 5119 | * |
| 5120 | * @param string $cap Capability. |
| 5121 | */ |
| 5122 | if ( ! $cap = apply_filters( 'pub_priv_sql_capability', '' ) ) { |
| 5123 | $cap = $post_type_obj->cap->read_private_posts; |
| 5124 | } |
| 5125 | |
| 5126 | if ( $full ) { |
| 5127 | if ( null === $post_author ) { |
| 5128 | $sql = $wpdb->prepare( 'WHERE post_type = %s AND ', $post_type ); |
| 5129 | } else { |
| 5130 | $sql = $wpdb->prepare( 'WHERE post_author = %d AND post_type = %s AND ', $post_author, $post_type ); |
| 5131 | } |