PHP Exercises: Create an array taking two middle elements from a given array of integers of length even

PHP Basic Algorithm: Exercise-100 with Solution

Write a PHP program to create an array taking two middle elements from a given array of integers of length even.

Sample Solution:

PHP Code :

<?php
// Define a function named 'test' that takes an array of numbers as a parameter
function test($numbers)
 { 
    // Calculate the index of the middle element in the array
    $middleIndex = sizeof($numbers) / 2;
    
    // Return a new array containing the two elements in the middle of the input array
    return [$numbers[$middleIndex - 1], $numbers[$middleIndex]];
 }   

// Call the 'test' function with an array [1, 5, 7, 9, 11, 13] and store the result in $result
$result = test([1, 5, 7, 9, 11, 13]);

// Print the new array containing the middle two elements using 'implode' and 'echo'
echo "New array: " . implode(',', $result);
?>

Explanation:

• Function Definition:
• A function named test is defined, which takes an array of numbers called $numbers as a parameter.
• Calculate Middle Index:
• The variable $middleIndex is calculated as sizeof($numbers) / 2, which finds the middle index of the array. This calculation assumes the array has an even number of elements.
• Return Middle Elements:
• The function returns an array containing two elements:
• The element just before the middle: $numbers[$middleIndex - 1].
• The element at the middle: $numbers[$middleIndex].

Output:

New array: 7 9

Flowchart:

PHP Code Editor:

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