How to sort values ​​in an array by size in PHP

PHP is a commonly used server-side scripting language that is widely used in website development and data processing fields. In PHP, it is a very common requirement to sort the values ​​in an array by size. By using the built-in sort function, you can easily sort arrays. The following will introduce how to use PHP to sort the values ​​in the array by size, and attach specific code examples:

1. Sort the values ​​in the array in ascending order:

<?php
$arr = array(5, 3, 8, 1, 4);

// 使用sort()函数对数组进行升序排序
sort($arr);

// 输出排序后的数组
print_r($arr);
?>

In the above code , first defines an array $arr containing 5 integer values. Then use PHP's sort() function to sort the array $arr in ascending order, and finally output the sorted array through the print_r() function.

2. Sort the values ​​in the array in descending order:

<?php
$arr = array(5, 3, 8, 1, 4);

// 使用rsort()函数对数组进行降序排序
rsort($arr);

// 输出排序后的数组
print_r($arr);
?>

In the above code, an array $arr containing 5 integer values ​​is also defined. Then use PHP's rsort() function to sort the array $arr in descending order, and finally output the sorted array.

In addition to the sort() and rsort() functions, PHP also provides asort() and arsort() functions for sorting associative arrays in ascending and descending order by value, krsort() and krsort() functions Used to sort associative arrays in descending and ascending order by key.

Through the above code examples, you can see that it is very simple and convenient for PHP to sort the values ​​in the array by size. Developers can choose the appropriate sorting function according to specific needs and easily implement sorting operations on arrays.

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