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using json_encode in the quercus PHP environment caused some crashes recently - which I've filed a bug for and created a workaround.

I've also created this bug http://bugs.caucho.com/view.php?id=2014 on array_multisort. I need it fixed :(

JFYI, the quercus library is licensed under the GPL, and can run in java servers other than Caucho's Resin. It is a fairly complete implementation of PHP 5.