Using PHP array_reverse() to Reverse Indexed and Associative Arrays

In PHP, you can use array_reverse() function to reverse the order of elements in an array. This function takes an array as a parameter and returns a new array with elements in reverse order.

Below is a concrete example code using array_reverse() function:

<?php
// 定义一个数组
$numbers = array(1, 2, 3, 4, 5);

// 使用array_reverse()函数反转数组
$reversedNumbers = array_reverse($numbers);

// 输出反转后的数组
print_r($reversedNumbers);
?>

In the above code, we first define an array named $numbers containing some integers. Then we use array_reverse() to reverse $numbers and store the result in a new array $reversedNumbers. Finally we use print_r() to output $reversedNumbers.

Running the above code will produce the following output:

Array
(
    [0] => 5
    [1] => 4
    [2] => 3
    [3] => 2
    [4] => 1
)

As you can see, the output is a new array with the elements of the original $numbers in reverse order.

The array_reverse() function can also be used with associative arrays. Below is an example code that reverses an associative array:

<?php
// 定义一个关联数组
$fruits = array(
    'apple' => '苹果',
    'banana' => '香蕉',
    'orange' => '橙子'
);

// 使用array_reverse()函数反转关联数组
$reversedFruits = array_reverse($fruits);

// 输出反转后的关联数组
print_r($reversedFruits);
?>

Running the above code will produce the following output:

Array
(
    [orange] => 橙子
    [banana] => 香蕉
    [apple] => 苹果
)

You can see the result is a new array where the key‑value pairs of the original $fruits are reversed.

Summary: Using PHP's array_reverse() function can conveniently reverse the order of elements in an array. Whether it is an indexed array or an associative array, array_reverse() works correctly. Just pass the array to array_reverse() and store the returned result in a new array to achieve reversal.

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