[PHP] isset()

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People
I tried to check if teh field has set a vaule in it before submit using isset with the 
sniplet below

if ((isset($AgeChild))=="false") {
$AgeChild = "NA";
}

The resule is that it always displays NA whether or not it has vaule in the field, 
what is the correct way of using isset for this purpose? Or should I use empty() ?
Jack
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"There is nothing more rewarding than reaching the goal you set for yourself"