WP_List_Table::get_default_primary_column_name(): string

1232	protected function get_default_primary_column_name() {1233		$columns = $this->get_columns();1234		$column  = '';1235 1236		if ( empty( $columns ) ) {1237			return $column;1238		}1239 1240		/*1241		 * We need a primary defined so responsive views show something,1242		 * so let's fall back to the first non-checkbox column.1243		 */1244		foreach ( $columns as $col => $column_name ) {1245			if ( 'cb' === $col ) {1246				continue;1247			}1248 1249			$column = $col;1250			break;1251		}1252 1253		return $column;1254	}