php - setting up if(!filter_var($email, FILTER_VALIDATE_EMAIL)) -

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i running insert form , checking errors. when try put if(!filter_var($email, filter_validate_email)) in if statement, loads blank white page no matter what. not set on server? how if that's case.

here context trying use it:

if(empty($_post['email']) && !filter_var($email, filter_validate_email)) {

thanks


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