


第三方库ksortRecursive可用于PHP多维数组排序,支持按多个键的升序或降序排序,简化了处理复杂多维数组的排序过程。
Black technology for multi-dimensional sorting of PHP arrays: implemented using third-party libraries
在处理复杂的多维数组时,对它们进行多维排序往往是一个令人头疼的任务。PHP原生函数只能对一维数组排序,无法满足多维排序的需求。这时,我们可以求助于第三方库来简化排序过程。
库推荐:ksortRecursive
ksortRecursive是一个轻量级的PHP库,专门针对多维数组排序设计。它提供了一种简单易用的API,可以快速方便地实现各种多维排序。
安装
使用Composer安装ksortRecursive:
composer require justinwalsh/ksort
用法
使用ksortRecursive对多维数组排序非常简单。以下代码演示如何根据多个键对数组进行多维排序:
use JustinWalsh\KsortRecursive\KsortRecursive; $arr = [ [ 'name' => 'John Doe', 'age' => 50, 'city' => 'New York' ], [ 'name' => 'Jane Doe', 'age' => 40, 'city' => 'London' ], [ 'name' => 'Peter Jones', 'age' => 30, 'city' => 'Paris' ] ]; $sortedArr = KsortRecursive::sortNestedArrayByKey($arr, ['name', 'age', 'city'], true); print_r($sortedArr);
输出结果:
Array ( [0] => Array ( [name] => Jane Doe [age] => 40 [city] => London ) [1] => Array ( [name] => John Doe [age] => 50 [city] => New York ) [2] => Array ( [name] => Peter Jones [age] => 30 [city] => Paris ) )
实战案例
在电商网站中,我们需要对商品列表进行多维排序。以下代码演示如何按价格和名称对商品列表排序:
$products = [ [ 'id' => 1, 'name' => 'Product 1', 'price' => 100 ], [ 'id' => 2, 'name' => 'Product 2', 'price' => 200 ], [ 'id' => 3, 'name' => 'Product 3', 'price' => 150 ] ]; $sortedProducts = KsortRecursive::sortNestedArrayByKey($products, ['price', 'name'], true); foreach ($sortedProducts as $product) { echo $product['name'] . ' - $' . $product['price'] . '<br>'; }
输出结果:
Product 1 - $100 Product 3 - $150 Product 2 - $200
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求和方法:1、用array_column()获取多维数组中指定一列的全部元素,语法“rray_column(数组, '指定列名')”,会返回一个包含全部元素的结果数组;2、用“array_sum(结果数组)”计算结果数组中所有元素的和即可。

增加元素的方法:1、使用array_push()函数,语法“array_push(二维数组,值1,值2...);”;2、使用array_splice()函数,语法“array_splice(二维数组,count(二维数组),0,元素值)”。

获取方法:1、用“array_values(数组)”将指定数组转为索引数组;2、用“array_search(数值,索引数组)”,在索引数组中搜索数值,返回对应的索引值(下标);3、用“索引值+1”语句获取元素在数组中的位置值。

php数组里面可以放数组。PHP数组可以存储所有类型的数据,当然也包括数组本身;如果一个数组中的元素是另一个数组,就构成了包含数组的数组,即多维度数组。数组的不同维度标志着需用几个下标(索引)来获取对应的数组元素,比如二维数组需用两个下标。

方法:1、循环遍历数组,语法“foreach($arr as $k=>$v){}”;2、循环体中,用“==”判断元素值是否为null,如果是则用unset()删除该元素,语法“if($v==null){unset($arr[$k]);}”。

php中只比较值的数组交集函数是“array_intersect()”;该函数用于比较两个(或更多个)数组的键值,语法“array_intersect(数组1,数组2...)”,会返回一个交集数组,所包含的值是从被比较的数组(数组1)中取。

去掉方法:1、用“sort($arr)”对数组进行升序排序,排序后该数组的第一个元素就是最小值,最后一个元素就是最大值;2、用“array_pop($arr)”删除最后一个元素,用“array_shift($arr)”删除第一个元素即可。

方法:1、对数组进行升序排序,并用“array_pop(数组)”和“array_shift(数组)”去除最大值和最小值;2、用“count(数组)”和“array_sum(数组)”获取数组长度与元素和;3、用“元素和/数组长度”计算平均数。


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