合并数据在php中我们利用array_merge()函数来实现，array_merge() 函数把两个或多个数组合并为一个数组。
如果键名有重复，该键的键值为最后一个键名对应的值（后面的覆盖前面的）。如果数组是数字索引的，则键名会以连续方式重新索引。
代码如下
结果如下：
第一种情况
array
(
[0] => 1
[1] => 2
[2] => 3
[3] => 4
[4] => 5
[5] => 6
[6] => 7
[7] => 8
[8] => 9
)
array
(
[0] => 1
[1] => 2
[2] => 3
[3] => 4
[4] => 5
[5] => 6
)
array
(
[0] => 7
[1] => 8
[2] => 9
[3] => 4
[4] => 5
[5] => 6
)
第二种情况
array
(
[0] => a
[1] => b
[2] => c
[3] => d
[4] => e
[5] => f
[6] => a
[7] => x
[8] => y
)
array
(
[0] => a
[1] => b
[2] => c
[3] => d
[4] => e
[5] => f
)
array
(
[0] => a
[1] => x
[2] => y
[3] => d
[4] => e
[5] => f
)
第三种情况
array
(
[0] => a
[1] => b
[2] => c
[3] => d
[4] => e
[5] => f
[6] => a
[7] => x
[8] => y
)
array
(
[1] => a
[2] => b
[3] => c
[4] => d
[5] => e
[6] => f
[7] => x
[8] => y
)
array
(
[1] => a
[7] => x
[8] => y
[2] => b
[3] => c
[4] => d
[5] => e
[6] => f
)
1）键名
为数字时，array_merge()不会覆盖掉原来的值，但＋合并数组则会把最先出现的值作为最终结果返回，而把后面的数组拥有相同键名的那些值“抛弃”掉（不是覆盖）
2）键名为字符时，＋仍然把最先出现的值作为最终结果返回，而把后面的数组拥有相同键名的那些值“抛弃”掉，但array_merge()此时会覆盖掉前面相同键名的值
注释：如果仅仅向 array_merge() 函数输入了一个数组，且键名是整数，则该函数将返回带有整数键名的新数组，其键名以 0 开始进行重新索引
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