<?php
$priorityQueue = new SplPriorityQueue();
var_dump($priorityQueue->getExtractFlags());
$priorityQueue->insert("a", 1);
$priorityQueue->insert("b", 2);
$priorityQueue->insert("c", 0);
echo "EXTR DEFAULT", PHP_EOL;
echo "value: ", $priorityQueue->top(), PHP_EOL;
$priorityQueue->setExtractFlags(SplPriorityQueue::EXTR_PRIORITY);
var_dump($priorityQueue->getExtractFlags() & SplPriorityQueue::EXTR_PRIORITY);
echo "EXTR_PRIORITY", PHP_EOL;
echo "priority: ", $priorityQueue->top(), PHP_EOL;
$priorityQueue->setExtractFlags(SplPriorityQueue::EXTR_BOTH);
echo "EXTR_BOTH", PHP_EOL;
print_r($priorityQueue->top());
echo "EXTR_DATA", PHP_EOL;
$priorityQueue->setExtractFlags(SplPriorityQueue::EXTR_DATA);
echo "value: ", $priorityQueue->top(), PHP_EOL;
