How to find the maximum value and subscript of an array in php

php method to find the maximum value and subscript of an array: 1. Use max() to obtain the maximum value of the array, the syntax is "$max=max($arr);"; 2. Use array_search() to search in the array The maximum value will return the corresponding subscript value, the syntax is "array_search($max,$arr)".

The operating environment of this tutorial: windows7 system, PHP8.1 version, DELL G3 computer

php finds the largest array Methods of values ​​and subscripts

php to find the maximum value and subscript of an array can be divided into two parts:

• Get the maximum value of the array

• Find the subscript (key name) of the value in the array based on the maximum value

Let’s give you a detailed introduction to the implementation method.

1. Get the maximum value of the array

PHP has many ways to get the maximum value of the array, such as sorting (ascending or descending order), so that the elements at the beginning or end are Best value.

But because there is still a need to obtain its subscript, sorting is not necessarily optional (it may destroy its original order).

Then we can just use the built-in function --max().

• max() function can return the maximum value in an array

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$arr=array(1,45,9,0,52,21,-1,40,-5);
var_dump($arr);
$max=max($arr);
echo "数组最大值为： ".$max."<br>";
?>

2 , Find the subscript (key name) of the value in the array based on the maximum value

PHP provides a built-in function--array_search()

This function can search in the array The given value, if successful returns the corresponding key name (subscript).

$index=array_search($max,$arr);
echo "最大值的下标为：".$index;

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