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run code in 150+ php & hhvm versions
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<?php var_dump(mb_strtolower('aÚa'));
Output for 5.6.8 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(4) "aúa"
Output for 4.3.0 - 5.5.35
string(4) "a�a"