How to find the subscript of the largest number in an array in php

Implementation steps: 1. Use the max() function to obtain and return the maximum number of the array, with the syntax "max(array)"; 2. Use the array_search() function to search for the maximum number in the array and return the corresponding next Just mark (key name), the syntax is "array_search (maximum number, array)".

The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer

In php, you can use the max() function and array_search() function to find the subscript of the largest number in the array.

Implementation steps:

Step 1: Use the max() function to find the maximum number of the array

max() function Returns the maximum value in an array, or the maximum value among several specified values.

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$arr=array("1"=>5,"8"=>7,"3"=>4,"7"=>5,"6"=>5);
var_dump($arr);
$max=max($arr);
echo "最大数为：".$max;
?>

Step 2: Use the array_search() function to get the subscript (key name) of the maximum value

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$arr=array("1"=>5,"8"=>7,"3"=>4,"7"=>5,"6"=>5);
var_dump($arr);
$max=max($arr);
echo "最大数为：".$max."<br>";
$res=array_search($max,$arr);
echo "最大数的下标为：".$res;
?>

Description:

array_search() function searches for a key value in the array and returns the corresponding key name.

array_search(value,array,strict)

Return value:

If the specified key value is found in the array, return the corresponding key name, otherwise return FALSE. If a key value is found more than once in the array, the key name matching the first found key value is returned.

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