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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 |
|---|---|
| 4538 | function get_posts_by_author_sql( $post_type, $full = true, $post_author = null, $public_only = false ) { |
| 4539 | global $wpdb; |
| 4540 | |
| 4541 | // Private posts |
| 4542 | $post_type_obj = get_post_type_object( $post_type ); |
| 4543 | if ( ! $post_type_obj ) |
| 4544 | return $full ? 'WHERE 1 = 0' : ' 1 = 0 '; |
| 4545 | |
| 4546 | // This hook is deprecated. Why you'd want to use it, I dunno. |
| 4547 | if ( ! $cap = apply_filters( 'pub_priv_sql_capability', '' ) ) |
| 4548 | $cap = $post_type_obj->cap->read_private_posts; |
| 4549 | |
| 4550 | if ( $full ) { |
| 4551 | if ( null === $post_author ) { |
| 4552 | $sql = $wpdb->prepare( 'WHERE post_type = %s AND ', $post_type ); |
| 4553 | } else { |
| 4554 | $sql = $wpdb->prepare( 'WHERE post_author = %d AND post_type = %s AND ', $post_author, $post_type ); |
| 4555 | } |
| 4556 | } else { |