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<?php $a = 1; @$b = $a + $a++; var_dump($b); $a = 1; @$b = $a + $a + $a++; var_dump($b); ?>
Output for hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(3) int(3)
Output for 4.3.0 - 5.6.28
int(2) int(3)