Efficient way to reverse multidimensional PHP array

Two effective ways to reverse multidimensional PHP arrays: Recursively using the array_reverse() function: Recursively reverse the elements of each nested array. PHP 7's array_reverse() function: Reverse multidimensional arrays using the new overload of the array_reverse() function.

Efficient way to reverse multi-dimensional PHP array

When dealing with multi-dimensional arrays in PHP, sometimes you need to reverse the array. This can be used in various scenarios, such as creating a reverse lookup table or simply displaying data in reverse order.

There are many ways to reverse a multi-dimensional array, this article will introduce the two most effective ones:

Using array_reverse() Recursion

This method uses the array_reverse() function and recursion to reverse the elements of each nested array.

<?php
function reverseArray($array) {
  if (!is_array($array)) {
    return $array;
  }
  return array_map('reverseArray', array_reverse($array));
}

Using PHP 7’s array_reverse()

PHP 7 introduces a new overload of the array_reverse() function , which allows inversion of multidimensional arrays.

<?php
function reverseArray(array &$array): void {
  array_reverse($array, true);
}

Practical case

To use these methods to reverse a multidimensional array, you can follow these steps:

<?php
$array = [
  'name' => 'John Doe',
  'profile' => [
    'age' => 30,
    'address' => '123 Main Street',
  ],
];

// 使用递归方法
$reversedArray = reverseArray($array);

// 使用 PHP 7 方法
reverseArray($array);

print_r($reversedArray); // 显示反转后的数组

Output:

Array
(
    [name] => John Doe
    [profile] => Array
        (
            [address] => 123 Main Street
            [age] => 30
        )
)

As you can see, both methods successfully reverse the multidimensional array. You can choose the most appropriate method based on your project's specific requirements.

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