Avoiding NOTICEs on Array References

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I have many places where I use references like this:

	if ($fields['flags']['someflag']) ...

or perhaps

	if ($_POST['checkboxfieldname']) ...

If there is no value for 'someflag', or if the check box was not 
checked -- both of which are often the case -- these generate errors at 
level E_NOTICE.  Is there any way to prevent references to missing 
array elements from generating errors without turning off all E_NOTICE 
notifications?

Thanks,

--
Tom

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