Gets a list of sortable columns.

Return

Source

protected function get_sortable_columns() {
	/*
	 * The initial sorting is by 'Requested' (post_date) and descending.
	 * With initial sorting, the first click on 'Requested' should be ascending.
	 * With 'Requester' sorting active, the next click on 'Requested' should be descending.
	 */
	$desc_first = isset( $_GET['orderby'] );

	return array(
		'email'             => 'requester',
		'created_timestamp' => array( 'requested', $desc_first ),
	);
}

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