<?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

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