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"; $b = 0; echo "b is " . is_numeric($b) . "
"; $c = 32.5; echo "c is " . is_numeric($c) . "
"; $d = "32"; echo "d is " . is_numeric($d) . "
"; $e = true; echo "e is " . is_numeric($e) . "
"; $f = null; echo "f is " . is_numeric($f) . "
"; ?>