[PHP-NOTES] note 130414 added to class.splminheap

To expand on gom's comment, SplMinHeap will also take into account the subsequent elements of the array you inserted, if the elements before that are equal.

<?php 
$heap = new SplMinHeap();
$heap->insert([0, 10]);
$heap->insert([0, 30]);
$heap->insert([0, 15]);
while (!$heap->isEmpty()) {
    [$a, $b] = $heap->extract();
    echo "a:$a, b:$b\n";
}
echo "---\n";
$heap->insert([0, 10, 100]);
$heap->insert([0, 10, 300]);
$heap->insert([0, 10, 150]);
while (!$heap->isEmpty()) {
    [$a, $b, $c] = $heap->extract();
    echo "a:$a, b:$b, c:$c\n";
}
?>

will output:

a:0, b:10
a:0, b:15
a:0, b:30
---
a:0, b:10, c:100
a:0, b:10, c:150
a:0, b:10, c:300
----
Server IP: 45.112.84.4
Probable Submitter: 80.90.5.137 (proxied: 103.157.49.159)
----
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