How to find the maximum and minimum value in an array in php
Apr 25, 2023 am 09:05 AMIn 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.
- 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
- 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
- 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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