SPLHeap.php

<?php

// Really simple heap that expects to store numbers
class Heap extends SPLHeap
{
	public function compare($value1, $value2)
	{
		return $value2 - $value1;
	}
}

$heap = new Heap();

echo 'An empty heap contains ' . $heap->count() . ' entries.' . PHP_EOL . PHP_EOL;

// Add 20 random numbers
echo 'Inserting data...' . PHP_EOL . PHP_EOL;
for ($i = 0; $i < 20; $i++) {
	$heap->insert(rand());
}

echo 'Now we have ' . $heap->count() . ' entries.' . PHP_EOL . PHP_EOL;

// Iterate over the heap, printing the numbers
echo 'Here they are:' . PHP_EOL . PHP_EOL;
foreach ($heap as $num) {
	echo $num . PHP_EOL;
}
echo PHP_EOL;

echo 'Now we have ' . $heap->count() . ' entries.' . PHP_EOL;