本文实例讲述了PHP实现数组根据某个字段进行水平合并，横向合并。分享给大家供大家参考，具体如下：

PHP数组水平合并，横向合并，两条数据合并成一行

需求

将两个素组中日期相同的合并成一行

数组a

1. Array
2. (
3. [0] => Array
4. (
5. [date] => 2019-04-02
6. [today_pay_money] => 168.00
7. [today_pay_num] => 1
8. [yesterday_pay_money] => 999.00
9. [yesterday_pay_num] => 1
10. )
11. [1] => Array
12. (
13. [date] => 2019-04-09
14. [today_pay_money] => 0.01
15. [today_pay_num] => 1
16. [yesterday_pay_money] => 0.00
17. [yesterday_pay_num] => 0
18. )
19. [2] => Array
20. (
21. [date] => 2019-05-05
22. [today_pay_money] => 0.01
23. [today_pay_num] => 1
24. [yesterday_pay_money] => 2.00
25. [yesterday_pay_num] => 1
26. )
27. [3] => Array
28. (
29. [date] => 2019-05-11
30. [today_pay_money] => 0.00
31. [today_pay_num] => 0
32. [yesterday_pay_money] =>
33. [yesterday_pay_num] => 1
34. )
35. )

数组B

1. Array
2. (
3. [0] => Array
4. (
5. [date] => 2019-05-07
6. [today_pay_money1] => 0
7. [today_pay_num1] => 0
8. [yesterday_pay_money1] => 0
9. [yesterday_pay_num1] => 0
10. )
11. [1] => Array
12. (
13. [date] => 2019-05-11
14. [today_pay_money1] => 0
15. [today_pay_num1] => 0
16. [yesterday_pay_money1] => 1
17. [yesterday_pay_num1] => 1
18. )
19. )

需要格式

1. Array
2. (
3. [2019-04-02] => Array
4. (
5. [date] => 2019-04-02
6. [today_pay_money] => 168.00
7. [today_pay_num] => 1
8. [yesterday_pay_money] => 999.00
9. [yesterday_pay_num] => 1
10. )
11. [2019-04-09] => Array
12. (
13. [date] => 2019-04-09
14. [today_pay_money] => 0.01
15. [today_pay_num] => 1
16. [yesterday_pay_money] => 0.00
17. [yesterday_pay_num] => 0
18. )
19. [2019-05-05] => Array
20. (
21. [date] => 2019-05-05
22. [today_pay_money] => 0.01
23. [today_pay_num] => 1
24. [yesterday_pay_money] => 2.00
25. [yesterday_pay_num] => 1
26. )
27. [2019-05-11] => Array
28. (
29. [date] => 2019-05-11
30. [today_pay_money] => 0.00
31. [today_pay_num] => 0
32. [yesterday_pay_money] =>
33. [yesterday_pay_num] => 1
34. [today_pay_money1] => 0
35. [today_pay_num1] => 0
36. [yesterday_pay_money1] => 1
37. [yesterday_pay_num1] => 1
38. )
39. [2019-05-07] => Array
40. (
41. [date] => 2019-05-07
42. [today_pay_money1] => 0
43. [today_pay_num1] => 0
44. [yesterday_pay_money1] => 0
45. [yesterday_pay_num1] => 0
46. )
47. )

代码实现

先将a,b数组合并，判断当前日期下是否空，空的话直接赋值，不空的话，将已有素组和当前数组合并

1. $total = array_merge($a,$b));
2. $res = array();
3. foreach ($total as $k => $v) {
4. if (emptyempty($res[$v['date']]))
5. $res[$v['date']] = $v;
6. else
7. $res[$v['date']]= array_merge($res[$v['date']],$v);
8. }