Why do you not take advantage of spl's data structures ?

[NoiseByNorthwest]

For example, to maintain a sorted collection you could use one of spl's heap based containers.

http://www.php.net/manual/en/spl.datastructures.php

[schmittjoh]

So far, I've mainly spent time designing the API, there is no particular reason why I don't use SPL data structure except that I haven't looked into leveraging them.

[migueleliasweb]

+1 spl