How to find the maximum value in an array in php

Two methods: 1. Use max() to get the maximum value, the syntax is "max($arr)". 2. Use "arsort($arr)" to sort the array in descending order. After sorting, the first element of the array is the maximum value. Use "reset($arr)" or "array_key_first($arr)" to take it out.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php seeks the array Two methods of maximum value

Method 1: Directly use the built-in function max()

max() function can return an array Maximum value

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

Method 2: Sort the array elements in descending order and take out the first element

Use arsort() to Sort the array in descending order

$arr=array(52,1,45,9,0,21,-1,40,-5);
arsort($arr);
var_dump($arr);

Then the first element of the array is the required maximum value, just take it out.

To get the first element, you can use the reset() or array_key_first() function.

• array_key_first() Get the first key value of the specified array.

• #reset() function can point the internal pointer in the array to the first element and return the value of the first array element. If the array is empty, it returns a Boolean value False.

echo "数组最大值为： ".reset($arr)."<br>";
echo "数组最大值为： ".array_key_first($arr);

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