The lack of distinction between array vs hashtable isn't a big deal. Array as a map from integers to items works fine in practice. Even speaking of algorithm performance, it's fine for the uses you have on a web server. (Any other use of PHP is clearly insane. :) )

You speak like someone who hasn't worked much in PHP. When you do, a lot of quirks and flaws really bother you and slow down during everyday tasks, but the ones you mentioned aren't they.