<?php $a = 1.1; $b = -1.1; $c = $a; $c += $a; var_dump($c); $c += $b; var_dump($c); $c += $b; var_dump($c); $c += $b; var_dump($c); $d = -0.00001893; $d += -1.893000000000000000000000009;
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