Types of PHP arrays - multidimensional arrays

Types of PHP arrays - multidimensional arrays

What is a PHP multidimensional array?

The two articles introduced earlier "Types of PHP arrays-numeric index array" and "Types of PHP arrays-associative arrays" They are all one-dimensional arrays. Today we will introduce multi-dimensional arrays in detail!

Arrays with more than one dimension can be called multi-dimensional arrays

We need to understand that an array is not necessarily a simple list of subscripts and values. In fact, each element in the array The elements can also be another array.

So if the array element in a one-dimensional array is also an array, then it becomes a two-dimensional array.

PHP multi-dimensional array sample code

##Dimensions of the array: two-dimensional

Define the above two-dimensional array:

<?php
$arr = [[&#39;王刚&#39;, &#39;张丽&#39;, &#39;刘伟&#39;], [&#39;孙丽&#39;, &#39;李强&#39;,&#39;李国庆&#39;], [&#39;赵园园&#39;,&#39;丁丽丽&#39;] ];
echo count($arr); //统计数组的元素个数
echo count($arr, true);
?>

The way to obtain the element "Li Qiang" in the above two-dimensional array is as follows:

<?php
header("Content-Type:text/html; charset=utf-8");
$arr = [[&#39;王刚&#39;, &#39;张丽&#39;, &#39;刘伟&#39;], [&#39;孙丽&#39;, &#39;李强&#39;,&#39;李国庆&#39;], [&#39;赵园园&#39;,&#39;丁丽丽&#39;] ];
echo $arr[1][1]
?>

The output result is :

##Dimensions of the array: three-dimensional

Method to obtain "Li Qiang" and "Liu Jun":

<?php
header("Content-Type:text/html; charset=utf-8");
$arr=[ [[&#39;王刚&#39;,&#39;张丽&#39;,&#39;刘伟&#39;],  [&#39;孙丽&#39;,&#39;李强&#39;,&#39;李国庆&#39;],  [&#39;赵园园&#39;,&#39;丁丽丽&#39;] ], 
[ [&#39;宋红&#39;,&#39;马小丽&#39;], [&#39;张颖&#39;,&#39;刘军&#39;,&#39;黄涛&#39;], [&#39;杜磊&#39;,&#39;朱婷婷&#39;]],];
echo $arr[0][1][1];//获取李强的方式
echo "<br>";
echo $arr[1][1][1];//获取刘军的方式
?>

The output result is:

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