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run code in 150+ php & hhvm versions
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<?php $array = array( "foo" => 1, "bar" => 0, "test"=> 0, );$mask = 0;$i = 0;foreach($array as $value){$mask |= $value << $i;$i++;}var_dump($mask);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(1)