<?php

$heap = new SplMinHeap();

// empty heap is not allowed
try {
    $heap->top();
}
catch (RuntimeException $e) {
    echo 'Exception: heap is empty' . PHP_EOL;
}

// empty heap is allowed and possible
if ($heap->isEmpty()) {
    echo 'isEmpty says that the heap is empty';
}

Exception: heap is empty
isEmpty says that the heap is empty

• Changing the look of the tree of RecursiveTreeIterator
• Access data of Traversable with IteratorIterator
• Create an instance without calling constructor of the class

PHP 8.2, Laminas MVC 3.2, Symfony 5.2, Laravel 8.28, PHPUnit 9.5, Doctrine ORM 2.8