Reverse an array using PHP's array_reverse() function

Use PHP's array_reverse() function to reverse an array

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

The following is a specific example code using the 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, which contains some integers. We then reverse the $numbers array using the array_reverse() function and store the result in a new array called $reversedNumbers. Finally, we use the print_r() function to print out the $reversedNumbers array.

Run the above code and you will get the following output:

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

You can see that the output result is a new array in which the elements in the original array $numbers are arranged in reverse order.

The array_reverse() function can be used not only for ordinary index arrays, but also for associative arrays. The following is a sample code that uses the array_reverse() function to reverse 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);
?>

Run the above code, you will get the following output:

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

You can see that the output result is the original associative array A new array of key-value pairs in $fruits sorted in reverse order.

Summary: Use PHP's array_reverse() function to conveniently reverse the order of elements in an array. Whether it is an indexed array or an associative array, the array_reverse() function can handle it correctly. Simply pass the array to be reversed as a parameter to the array_reverse() function and store the returned result in a new array to achieve the array reversal function.

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