Gets a list of all, hidden, and sortable columns.

Return

Source

protected function get_column_info() {
	$columns  = get_column_headers( $this->_screen );
	$hidden   = get_hidden_columns( $this->_screen );
	$sortable = array();
	$primary  = $this->get_default_primary_column_name();

	return array( $columns, $hidden, $sortable, $primary );
}

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