(PHP 5 >= 5.3.0, PHP 7)
SplHeap::extract — Extracts a node from top of the heap and sift up
public SplHeap::extract ( ) : mixed
This function has no parameters.
The value of the extracted node.
Throws RuntimeException when the data-structure is empty.
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https://www.php.net/manual/en/splheap.extract.php