PHP arrays - rotate array items left d times without using built-in array_pop, array_shift. Uses array_values so times out HackerRank challenge.

php-array-left-rotation.php

<?php

// array to rotate 
$a = [1,2,3,4,5];

// the number of left rotations
$d = 4;

// we want 5,1,2,3,4 as the end result

for ($i = 0; $i < $d; $i++) {
    
    // size of array is next position to add on to the end
    $next = sizeof($a);
 
    // the value of the front of the array (like a queue)
    $current = $a[0];
    
    // remove the item at the front of the array which is saved now into currentval
    unset($a[0]);
    
    // take current value and add it to the end of the array instead
    $a[$next] = $current; 
    
    // reset the array's indexing
    $a = array_values($a);
    
}

// rotated array (return $a in function where you pass $a and $d)
print_r($a);

?>