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run code in 200+ php & hhvm versions
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<?php var_dump(mb_strtolower('aäeéiîoöu12'));
Output for 5.6.0 - 7.2.0
string(15) "aäeéiîoöu12"
Output for 4.3.0 - 5.5.38
string(15) "a�e�i�o�u12"