Here is the offending situation:
<?php
/* E_NOTICE: undefined index, returns false */ unset($a); echo is_array($a['foo']['asdf']);
/* returns false */ $a = 'asdf'; echo isset($a['foo']['asdf']);
/* returns false */ $a = array('foo' => 'asdf'); echo is_array($a['foo']['asdf']);
/* E_ERROR Invalid offset */ $a = 'asdf'; echo is_array($a['foo']['asdf']);
The last one is the biggie, the solution of course is to have something like:
if (isset($a['foo']['asdf']) && is_array($a['foo']['asdf']) {
This is a big BC issue, IMO, and might be worth asking internals why the E_ERROR is given vs. a E_WARNING.
Curt
Well, what I always know about my variables is if they are arrays or scalar ;) And I don't consider warning to be much nicer then error
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