function with if-else condition

<?php
namespace Codecademy;

$learner_one = ["is_correct"=>FALSE, "box"=>["shape"=>"none", "color"=>"none"]];

$learner_two = ["is_correct"=>TRUE, "box"=>["shape"=>"none", "color"=>"none"]];

//function for arrays - make permanent changes to $box variable
  function markAnswer($is_answer_correct, &$box){
    if ($is_answer_correct){
      $box["shape"] = "checkmark";
      $box["color"] = "green";
    } else {
      $box["shape"] = "x";
      $box["color"] = "red";
    }
  }
markAnswer($learner_one["is_correct"], $learner_one["box"]);
markAnswer($learner_two["is_correct"], $learner_two["box"]);
print_r($learner_one["box"]);
print_r($learner_two["box"]);


function chooseCheckoutLane($items) {
  if ($items <=12) {
    return "express lane";
  }
  else {
    return "regular lane";
  }
}

function canIVote($age){
  if ($age>=18){
    return "yes";
  } else {
    return "no";
  }
}

// test for each condition
echo chooseCheckoutLane(20);
echo chooseCheckoutLane(5);
echo canIVote(30);
echo canIVote(16);