Playing with number in php

$s= 640.81 – 636.85;
$e= floatval(sprintf(“%01.2f”, $s));
$f=floatval(money_format(‘%.2n’, $s));
$g=floatval(number_format ($s , 2 , ‘.’ , ”));
echo ($e+.04);
echo ($f+.04);
echo ($g+0.04);

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