PHP Exercises: Rotate the elements of a given array of integers in left direction and return the new array

PHP Basic Algorithm: Exercise-90 with Solution

Write a PHP program to rotate the elements of a given array of integers (length 4 ) in left direction and return the new array.

Sample Solution:

PHP Code :

<?php
// Define a function named 'test' that rotates the elements of the given array.
function test($a1)
{ 
    // Return a new array with elements rotated by one position to the left.
    return [$a1[1], $a1[2], $a1[3], $a1[0]];
}

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

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

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

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

Explanation:

• Function Definition:
• A function named test is defined with one parameter:
• $a1: an array of numbers.
• Array Rotation:
• The function returns a new array that rotates the elements of $a1 by one position to the left:
• It takes the second element $a1[1], the third element $a1[2], the fourth element $a1[3], and then the first element $a1[0], creating a new array in this order.
• Array Initialization:
• An array $a is created with the initial values: [10, 20, -30, -40].
• 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 Rotated Array:
• The rotated array is displayed using echo and implode to format the rotated array as a string:

Output:

Original array: 10,20,-30,-40
Rotated array: 20,-30,-40,10

Flowchart:

PHP Code Editor:

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