小编Maw*_* HL的帖子

我不确定在这里问这样的问题是否合适.但我不知道这个绿色版本的php意味着什么.在PHP 7发布之后,我在互联网上看到了这个术语,但我没有看到为什么PHP 7被称为PHP的绿色版本的任何解释.

我有几个学生在php数组中得分.

$ firstarray:

Array ( 
       [0] => Array ( 
             [6] => Array ( //I want to skip this student from ranking
                     [ENGLISH] => 45.00 
                     [MATHEMATICS] => 5.00 
                     [SCIENCE] => 40.00 
                    ) 
                ) 
      [1] => Array ( 
             [7] => Array ( 
                     [ENGLISH] => 41.00 
                     [MATHEMATICS] => 40.00 
                     [SCIENCE] => 47.00 
                     ) 
                ) 
      ) 
      [2] => Array ( 
             [8] => Array ( 
                     [ENGLISH] => 42.00 
                     [MATHEMATICS] => 44.00 
                     [SCIENCE] => 40.00 
                     ) 
                )
      [3] => Array ( 
             [9] => Array ( 
                     [ENGLISH] …

我使用以下sql语句来汇总来自两个不同表的两列的值.该语句可以输出但不能输出所需的结果.

SELECT
SUM(`_income`.rate) AS Income,
SUM(`_expense`.rate) AS Expense,
SUM(_income.rate)-SUM(_expense.rate) AS Balance
FROM `_expense`, `_income`

我的桌子在这里:

CREATE TABLE IF NOT EXISTS `_expense` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `item` varchar(100) CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL,
  `qnty` int(11) NOT NULL,
  `rate` int(11) NOT NULL,
  `date` date NOT NULL,
  `CreatedByPHPRunner` int(11) NOT NULL,
  `remarks` text NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM  DEFAULT CHARSET=latin1 AUTO_INCREMENT=4 ;

-

- 转储表的数据 _expense

INSERT INTO `_expense` (`id`, `item`, `qnty`, `rate`, `date`, `CreatedByPHPRunner`,   `remarks`) VALUES …