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<?php $var1 = ''; $var2 = $var3 = null; $var1--; $var2--; $var3++; var_dump($var1); var_dump($var2); var_dump($var3);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(-1) NULL int(1)