How to reverse a two-dimensional array in php

php method to reverse a two-dimensional array: 1. Create a php sample file; 2. Define a two-dimensional array; 3. Reverse the array through the "array_reverse($a,true);" function; 4. , use "print_r" to print the reversed two-dimensional array.

The operating environment of this tutorial: windows10 system, PHP version 8.1, DELL G3 computer

php How to reverse a two-dimensional array ?

Use the array_reverse() function to achieve reversal.

array_reverse() The function returns an array in the reverse order of elements.

Description

array_reverse() function reverses the order of elements in the original array, creates a new array and returns it.

If the second parameter is specified as true, the key name of the element remains unchanged, otherwise the key name will be lost.

Syntax

array_reverse(array,preserve)

Parameters

array required. Specifies an array.

preserve

Optional. Specifies whether to retain the original array key names.

This parameter is newly added in PHP 4.0.3.

Possible values:

• true

• false

Return original Array, reverse array, flip array retaining the original array key name:

<?php
$a=array("Volvo","XC90",array("BMW","Toyota"));
$reverse=array_reverse($a);
$preserve=array_reverse($a,true);
print_r($a);
print_r($reverse);
print_r($preserve);?>

Output:

Array ( [0] => Volvo [1] => XC90 [2] => Array ( [0] => BMW [1] => Toyota ) ) Array ( [0] => Array ( [0] => BMW [1] => Toyota ) [1] => XC90 [2] => Volvo ) Array ( [2] => Array ( [0] => BMW [1] => Toyota ) [1] => XC90 [0] => Volvo )

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