Recursive functions are generally a bad idea especially in php.
By using a recursive function it is possible you may "smash the stack", which 
will crash an apache child (segfaults) and on a multi-threaded server take 
down the whole webserver.
Even with a default memory limit of 8 megs an attacker could crash php by 
accessing the same thread multiple times.

This is NOT a theoretical situation, I've actually came across it while 
writing a tree drawing code for a forum. The problem exists in all the php 
that I've tested (PHP 4.0.5,4.0.6,4.1.0RC5).

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