概念不赘述，先看代码
<?php
$arrayOne = [
1 => 'a',
'one' => 'b',
2 => 'c',
'two' => 'd'
];
$arrayTwo = [
0 => 'e',
'one' => 'f',
1 => 'g',
'three' => 'h'
];
$merge = array_merge($arrayOne, $arrayTwo);
$plus = $arrayOne + $arrayTwo;
$recursive = array_merge_recursive($arrayOne, $arrayTwo);
print_r($merge);
print_r($plus);
print_r($recursive);
运行结果
Array
(
[0] => a
[one] => f
[1] => c
[two] => d
[2] => e
[3] => g
[three] => h
)
Array
(
[1] => a
[one] => b
[2] => c
[two] => d
[0] => e
[three] => h
)
Array
(
[0] => a
[one] => Array
(
[0] => b
[1] => f
)
[1] => c
[two] => d
[2] => e
[3] => g
[three] => h
)
概述一下，
array_merge。数字键，两数组均保留并从0开始重新排列键值；字符串键，键名不同时均保留，键名相同时保留第二个数组中值。
+。无论数字键名或字符串键名，键名不同时均保留，键名相同时保留第一个数组中值。
array_merge_recursive。数字键，两数组均保留并从0开始重新排列键值；字符串键，键名不同时均保留，键名相同时生成二维数组保留两数组中出现的值。
