php - is not null condition in zend framework 2 -

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i new zf , i've started working zf2, don't find documentation syntax , all. issue how write is not null condition in zf2 syntax.

$select->where->notequalto('pe_name', '');

i've written not equal to, need is not null. don't know how write in syntax. can familiar me.

got it..!!

$select->where->isnotnull('pe_name');

and 

$select->where('pe_name not null');

also works.


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