php多位数组合并的三种方式
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。
原文地址:php多位数组合并的三种方式, 感谢原作者分享。

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