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php多位数组合并的三种方式

Jun 06, 2016 pm 08:13 PM
phpone timemergearrayWayillustrateFirst choice

首选说明一下这篇文章有点标题党的嫌疑,我前面写了一篇文章对比了php合并一维数组的三种方式,后来又用这三种方式都来处理了一下多维数组,奇怪的是array_merge和+都没有报错,我就以为他们也能用来处理多维数组。仔细观察了一下结果,才发现这两种方式其实

首选说明一下这篇文章有点标题党的嫌疑,我前面写了一篇文章对比了php合并一维数组的三种方式,后来又用这三种方式都来处理了一下多维数组,奇怪的是array_merge和+都没有报错,我就以为他们也能用来处理多维数组。仔细观察了一下结果,才发现这两种方式其实是来打酱油的。
请看代码

    $array1 = array(2,4,"color" => "red");
    $array2 = array("a", "b", "color" => "green", "shape" => "trapezoid", 4);
    $array3 = array("e","f","red"=>array("little"=>"little",3,5),2,4);
    $array4 = array("a","b","red"=>array("little"=>"big",4,6),8,9);
    echo "----------------array_merge---------------".PHP_EOL;
    print_r(array_merge($array3,$array4));
    echo "----------------+++++++++++++++++++++---------------".PHP_EOL;
    print_r($array3+$array4);
    echo "----------------array_merge_recursive---------------".PHP_EOL;
    print_r(array_merge_recursive($array3,$array4));

结果如下

----------------array_merge---------------
Array
(
    [0] => e
    [1] => f
    [red] => Array
        (
            [little] => big
            [0] => 4
            [1] => 6
        )
    [2] => 2
    [3] => 4
    [4] => a
    [5] => b
    [6] => 8
    [7] => 9
)
----------------+++++++++++++++++++++---------------
Array
(
    [0] => e
    [1] => f
    [red] => Array
        (
            [little] => little
            [0] => 3
            [1] => 5
        )
    [2] => 2
    [3] => 4
)
----------------array_merge_recursive---------------
Array
(
    [0] => e
    [1] => f
    [red] => Array
        (
            [little] => Array
                (
                    [0] => little
                    [1] => big
                )
            [0] => 3
            [1] => 5
            [2] => 4
            [3] => 6
        )
    [2] => 2
    [3] => 4
    [4] => a
    [5] => b
    [6] => 8
    [7] => 9
)

看完代码,我想聪明的看官您已经发现了打酱油的含义:array_merge和+把第一维数组的值都当作一个简单变量,然后用处理一维素组的方式把传进去的素组处理了一遍。
只有array_merge_recursive使用了迭代的方式处理了每一维度的素组。

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