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<?php $n = (integer)"45"; var_dump($n, empty($n) ? "" : number_format($n, 3), gettype($n));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(45) string(6) "45.000" string(7) "integer"