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)