Description:
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Documentation claims that __construct is public however the class is abstract and shouldnt be instantiated 

http://php.net/manual/en/splheap.construct.php

Test script:
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<?php
$x = new SplHeap();

<?php
$x = SplHeap::__construct ();

Expected result:
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PHP Fatal error:  Uncaught Error: Cannot instantiate abstract class SplHeap in ...

Fatal error: Uncaught Error: Cannot call constructor in ...

Actual result:
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PHP Fatal error:  Uncaught Error: Cannot instantiate abstract class SplHeap in ...

Fatal error: Uncaught Error: Cannot call constructor in ...