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run code in 150+ php & hhvm versions
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<?php function f() { global $x; $x = $x + 10; } $x = 0; $x += f(); var_dump($x);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(10)