How to Rotate Array Elements Left in PHP?

Reordering Array Elements through Left Rotation with PHP

The task of rotating array elements to the left, moving the first element to the last and updating indices, presents itself in programming contexts. For instance, suppose we have an array [1, 2, 3, 4] that we want to rotate. The result would be [2, 3, 4, 1].

Built-in PHP Function for Array Rotation

PHP does not provide a predefined function for array rotation. Hence, a custom approach is necessary.

Custom Rotation Method

The following code demonstrates a method for rotating an array in PHP:

<code class="php"><?php
$numbers = array(1,2,3,4);
array_push($numbers, array_shift($numbers));
print_r($numbers);
?></code>

Explanation

• array_shift($numbers): Removes the first element from the array (1 in this case)
• array_push($numbers, $first): Adds the removed element to the end of the array
• The result is the original array with the first element rotated to the end

Output

The output of the script will be:

Array
(
    [0] => 2
    [1] => 3
    [2] => 4
    [3] => 1
)

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