3v4l.org

run code in 300+ PHP versions simultaneously
<?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);

preferences:
65.99 ms | 402 KiB | 5 Q