PHP Exercises: Reverse a given array of integers and length 5

Last update on May 28 2025 13:04:53 (UTC/GMT +8 hours)

91. Reverse Array of Length 5

Write a PHP program to reverse a given array of integers and length 5.

Sample Solution:

PHP Code :

<?php
// Define a function named 'test' that reverses the order of elements in the given array.
function test($nums)
{ 
    // Return a new array with elements in reverse order.
    return [$nums[4], $nums[3], $nums[2], $nums[1], $nums[0]];
}

// Create an array $a with initial values.
$a = [10, 20, -30, -40, 50];

// Display the original array.
echo "Original array: " . implode(',', $a) . "\n";

// Call the 'test' function to reverse the array elements.
$result = test($a);

// Display the reversed array.
echo "Reverse array: " . implode(',', $result);
?>

Explanation:

Function Definition:

A function named test is defined with one parameter:

$nums: an array of numbers.

Array Reversal:

The function returns a new array that contains the elements of $nums in reverse order:

It explicitly selects elements in the order of index 4, 3, 2, 1, and 0, effectively reversing the array.

Array Initialization:

An array $a is created with the initial values: [10, 20, -30, -40, 50].

Display Original Array:

The original array is displayed using echo and implode to format the array as a string:

Function Call:

The test function is called with the array $a, and the result is stored in the variable $result.

Display Reversed Array:

The reversed array is displayed using echo and implode to format the reversed array as a string:

Output:

Original array: 10,20,-30,-40,50
Reverse array: 50,-40,-30,20,10

Flowchart:

For more Practice: Solve these Related Problems:

Write a PHP script to reverse a five-element array manually using a loop and output the reversed array.
Write a PHP function to swap elements from both ends of a five-element array until the entire array is reversed.
Write a PHP program to implement array reversal by iteratively exchanging elements and print the final array.
Write a PHP script to generate the reverse order of a fixed five-element array using custom indexing.

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