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run code in 150+ php & hhvm versions
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<?php var_dump(strtolower('x'.($a = 5 || strpos('f', $a))));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(2) "x1"