<?php

    $noland = 746;

     if (filter_var($noland, FILTER_VALIDATE_INT)) {

        echo $noland . ' is a valid number';

        } else {

           echo $noland . ' no number';

           }

?>

<?php

    $email = 'test@test.de';

    if (filter_var($email, FILTER_VALIDATE_EMAIL)) {

        echo $noland . 'emailaddresse ok';

        } else {

           echo $noland . 'no ok';

          }

?>