实用程序PHP函数来分页SQL查询

Posted 2021-02-27

	/**
	 * A utility method that builds out the SQL for the LIMIT / OFFSET chunk of the SQL
	 *
	 * @param page		the page that will be pulled, will affect the OFFSET
	 * @param perpage	how many items per page, will affect the LIMIT
	 * @return string	an SQL statement consisting of the LIMIT and OFFSET
	 */
	private function _buildLimitOffsetSQL($page,$perpage) {
		$limit = (is_numeric($perpage) && $perpage>0) ? $perpage : 10;
		$offset = (is_numeric($page) && $page>0) ? ($page-1)*$perpage : 0;
		return "LIMIT $limit OFFSET $offset";
	}