PHP合并数组+号和array_merge的区别

PHP的数组融合一般有两种做法，一种是直接使用加号相加，另一种则是使用array_merge函数进行相加，两者之间有点区别：

1.相加会证数组中的自然index不被重置

2.相加方法中，被加的数组内的值不会被覆盖

3.merge函数中的自然index会被重置

4.merge函数，无所谓被merge和merge关系，越后面的array参数，其值，会覆盖较前面的array参数相同键的值

例子：

数组1：

$arr1 = array(

10 => 'valueof10',

11 => 'valueof11',

'key1' => 'dataofkey1',

'key2' => 'dataofkey2',

'array' => array(

'key1' => 1,

'key2' => 'abc',

'key3' => array(

1, 2, 'name' => 'peter'

),

),

);

数组2：

$arr2 = array(

10 => 'newvalueof10',

11 => 'newvalueof11',

'key1' => 'newdataofkey1',

'key3' => 'newdataofkey3',

'array' => array(

'key1' => 2,

'key2' => 'defg',

'key3' => array(

1, 2, 'name' => 'jonathan', 'gender' => 'male'

),

),

);

结果比较：

array (size=6)

10 => string 'valueof10' (length=9)

11 => string 'valueof11' (length=9)

'key1' => string 'dataofkey1' (length=10)

'key2' => string 'dataofkey2' (length=10)

'array' =>

array (size=3)

'key1' => int 1

'key2' => string 'abc' (length=3)

'key3' =>

array (size=3)

0 => int 1

1 => int 2

'name' => string 'peter' (length=5)

'key3' => string 'newdataofkey3' (length=13)

array (size=8)

0 => string 'valueof10' (length=9)

1 => string 'valueof11' (length=9)

'key1' => string 'newdataofkey1' (length=13)

'key2' => string 'dataofkey2' (length=10)

'array' =>

array (size=3)

'key1' => int 2

'key2' => string 'defg' (length=4)

'key3' =>

array (size=4)

0 => int 1

1 => int 2

'name' => string 'jonathan' (length=8)

'gender' => string 'male' (length=4)

2 => string 'newvalueof10' (length=12)

3 => string 'newvalueof11' (length=12)

'key3' => string 'newdataofkey3' (length=13)