(array)
File: wp-admin/includes/class-wp-posts-list-table.php
protected function get_sortable_columns() { return array( 'title' => 'title', 'parent' => 'parent', 'comments' => 'comment_count', 'date' => array( 'date', true ), ); }
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https://developer.wordpress.org/reference/classes/wp_posts_list_table/get_sortable_columns