How to increase the dimensions of an array in php

Two methods: 1. Use array_chunk() to divide the array into new array chunks (sub-arrays), the syntax is "array_chunk(array, number of sub-array elements)". 2. Use array_merge_recursive() to merge an array with the same key name. The values ​​of the same key will be merged into a sub-array.

The operating environment of this tutorial: windows7 system, PHP8 version, DELL G3 computer

php increases the two dimensions of the array Method

Method 1: Use array_chunk() function

array_chunk() function splits an array into new array chunks.

Use this function to divide the array at each level of the specified array (fractal dimension) and then convert it into a higher-dimensional array.

Example 1: Convert one-dimensional array to two-dimensional array

<?php
header("Content-type:text/html;charset=utf-8");
$arr=array("Volvo","BMW","Toyota","Honda","Mercedes","Opel");
echo "原一维数组：";
var_dump($arr);

$chunk=array_chunk($arr,count($arr)/2);
echo "将一维数组转为二维数组：";
var_dump($chunk);
?>

Example 2: Convert two-dimensional array to three-dimensional array

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$arr= array
(
    array("张三",25,"男"),
    array("李四",21,"男"),
    array("娜娜",22,"女"),
	array("张三",25,"男"),
    array("李四",21,"男"),
    array("娜娜",22,"女")
);
echo "原二维数组：";
var_dump($arr);
echo "将二维数组转为三维数组：";
var_dump(array_chunk($arr,2));
?>

##Method 2: Use the array_merge_recursive() function

Use the array_merge_recursive() function to merge a Arrays with the same key name.

Merge arrays, when encountering the same key, merge the values ​​in the key into a sub-array

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$a = [1,&#39;2&#39;=>2,&#39;a&#39;=>&#39;a&#39;,&#39;b&#39;=>&#39;b&#39;];
$b = [&#39;a&#39;=>&#39;a&#39;,&#39;b&#39;=>&#39;d&#39;];
$c = array_merge_recursive($a,$b);
var_dump($c);
?>

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