<?php

function writeToQueue($input){

$output = "";

$output .= "<?php ";

$output .= "return [";

foreach($input as $value){

$output .= '"' . $value . '",' ;

}

$output .= "] ";

$output .= "?>";

$myfile = fopen("queue_1.php", "w+") or die("Unable to open file!");

fwrite($myfile, $output);

fclose($myfile);

}

function getQueue(){

$baseQueue = include "queue_1.php";

if(count($baseQueue) <= 0){

$baseQueue = [];

}

return $baseQueue;

}

function addToQueue($value){

$queue = getQueue();

array_push($queue,$value); // push into the array

var_dump($queue); // see results

writeToQueue($queue);

return getQueue(); // return the current results

}

// lifo

function getLastItem(){

$queue = getQueue();

$value = array_pop($queue);

writeToQueue($queue);

return $value;

}

// fifo function

function getFirstItem(){

$queue = getQueue();

$value = array_shift($queue);

writeToQueue($queue);

return $value;

}

function emptyQueue(){

writeToQueue([]);

}

function isQueueEmpty(){

$queue = getQueue();

if(count($queue) <= 0){

return true;

}

return false;

}