How to find the maximum and minimum value in an array in php

In PHP programming, it is often necessary to find the maximum and minimum values ​​in an array. This is one of the very important operations. This article will introduce several methods and functions to achieve this task.

1. Use PHP built-in functions to implement

PHP has several built-in functions that can easily obtain the maximum and minimum values ​​​​in the array.

a. max() function: Returns the largest value in an array.

Syntax: max(array $values)

Sample code:

$arr = array(2, 8, 5, 1, 7);
$max = max($arr);
echo "数组中的最大值是：" . $max;

Output result:

数组中的最大值是：8

b. min() function: returns an array the smallest value in .

Syntax: min(array $values)

Sample code:

$arr = array(2, 8, 5, 1, 7);
$min = min($arr);
echo "数组中的最小值是：" . $min;

Output result:

数组中的最小值是：1

2. Use sort() function to implement

The sort() function in PHP can be used to sort arrays. With this function, we can quickly find the maximum and minimum values ​​of an array.

a. Find the maximum value of the array

Sample code:

$arr = array(2, 8, 5, 1, 7);
sort($arr); // 从小到大排序
$max = end($arr); // 获取最后一个元素，即最大值
echo "数组中的最大值是：" . $max;

Output result:

数组中的最大值是：8

b. Find the minimum value of the array

Sample code:

$arr = array(2, 8, 5, 1, 7);
sort($arr); // 从小到大排序
$min = reset($arr); // 获取第一个元素，即最小值
echo "数组中的最小值是：" . $min;

Output result:

数组中的最小值是：1

3. Implement it by yourself

If you don’t want to use the built-in function or sort() function, you can also Implement the algorithm for finding the maximum and minimum values ​​yourself. Here are some sample codes.

a. Find the maximum value of the array

Sample code:

$arr = array(2, 8, 5, 1, 7);
$max = $arr[0]; // 假设第一个元素是最大值
foreach ($arr as $val) {
    if ($val > $max) { // 如果有更大的元素，更新最大值
        $max = $val;
    }
}
echo "数组中的最大值是：" . $max;

Output result:

数组中的最大值是：8

b. Find the minimum value of the array

Sample code:

$arr = array(2, 8, 5, 1, 7);
$min = $arr[0]; // 假设第一个元素是最小值
foreach ($arr as $val) {
    if ($val < $min) { // 如果有更小的元素，更新最小值
        $min = $val;
    }
}
echo "数组中的最小值是：" . $min;

Output result:

数组中的最小值是：1

Summary: The above are several common methods and functions for obtaining the maximum and minimum values ​​​​of PHP arrays. You can and Get used to selecting and applying.

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