Audiogram - problem 3 .php

<?php
# Problem 2:

# Function:
function mergeSortedSequences(array $list1, array $list2) : array {
  $l1pointer = 0;
  $l2pointer = 0;
  
  $result = [];
  while ($l1pointer < count($list1) && $l2pointer < count($list2)) {
    if ($list1[$l1pointer] < $list2[$l2pointer]) {
      array_push($result, $list1[$l1pointer]);
      $l1pointer++;
    } else {
      array_push($result, $list2[$l2pointer]);
      $l2pointer++;
    }
  }
  if($l1pointer == count($list1))
     $result = array_merge($result, array_slice($list2, $l2pointer));
  elseif($l2pointer == count($list2))
     $result = array_merge($result, array_slice($list1, $l1pointer));
  
  return $result;
}

# Function Usage:
echo 'Insert the first list: ';
$list1 = json_decode(fgets(fopen("php://stdin","r")));
echo 'Insert the second list: ';
$list2 = json_decode(fgets(fopen("php://stdin","r")));

echo json_encode( mergeSortedSequences($list1, $list2) ), PHP_EOL;