The difference between PHP array merge and addition and array_merge

The difference between PHP array merge and addition and array_merge_PHP tutorial

WBOY

Release： 2016-07-13 17:16:15

Original

1195 people have browsed it

There is a little difference between array merging and array merging and array_merge array merging in PHP. Let me introduce to you the difference between array_merge and array merging.

+ :

The one that appears first will overwrite the one that appears later

array_merge:

What appears after

will overwrite what appears before. But if it is a numerical index, it is a superimposed effect.

$array2 = Array( 0 => 222,

The code is as follows

代码如下

复制代码

$array1 = Array(
0 => 111
);

$array2 = Array(
0 => 222,
1 => 3333
);

array_merge 后:
Array
(
    [0] => 111
    [1] => 222
    [2] => 3333
)

+ 后:
Array
(
[0] => 111
[1] => 3333
)

情况二:

$array1 = Array(
0 => 111
);

$array2 = Array(
    'h' => 222,
    1 => 3333
);
array_merge 和 + 的结果是一样:
Array
(
    [0] => 111
    [h] => 222
    [1] => 3333
)

Copy code

$array1 = Array(

0 => 111
);

1 => 3333 );

) Scenario 2:

$array1 = Array( 0 => 111 ); $array2 = Array( 'h' => 222, 1 => 3333 ); The results of array_merge and + are the same: Array ( [0] => 111 [h] => 222 [1] => 3333 ) The result is obvious: array_merge is the addition of two arrays. If the key value is a number, it will be rearranged. If not, it will not be modified. And + means adding two arrays will replace the same key value with the previous array. If the key value is different, it will have the same effect as array_merge. http://www.bkjia.com/PHPjc/628658.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/628658.htmlTechArticleThere is a little difference between the merging and adding of arrays and the merging of array_merge arrays in php. The following editor will give you some information Introduce the difference between array_merge and array addition and merge. + : The first one will be overwritten...