3 methods: 1. Use rsort() to sort the array in descending order, the syntax is "rsort(array);"; 2. Use arsort(), the syntax is "arsort(array)", which can be based on the array key The values are sorted in descending order; 3. Use krsort(), the syntax "krsort (array)", to sort in descending order according to the key name.
The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer
The arrays are sorted from large to small, that is, the Sort the array in descending order.
There are three commonly used methods for sorting arrays in descending order in PHP:
rsort() - Sort the array in descending order
arsort() - Sort the array in descending order according to the key value of the associative array
krsort() - Sort the array in descending order based on the key name of the associative array
1. Use rsort() - Sort the array in descending order
Example 1: Sort the elements in the array in descending numerical order
<?php $arr=array(4,6,2,22,11,85); var_dump($arr); rsort($arr); var_dump($arr); ?>
Example 2: Sort the elements in the array in descending alphabetical order
<?php $arr=array("Volvo","BMW","Toyota","a"); var_dump($arr); rsort($arr); var_dump($arr); ?>
2, arsort() - According to the value of the array, Sort the array in descending order
<?php $arr=array("Peter"=>"35","Ben"=>"37","Joe"=>"43"); var_dump($arr); arsort($arr); var_dump($arr); ?>
3. krsort() - Sort the array in descending order according to the keys of the array
<?php $arr=array("Peter"=>"35","Ben"=>"37","Joe"=>"43"); var_dump($arr); krsort($arr); var_dump($arr); ?>
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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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