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run code in 200+ php & hhvm versions
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<?php $string = "Nuevo León"; var_dump($string); $formatted_string = mb_strtoupper($string); var_dump($formatted_string);
based on iD0n2
Output for 5.6.8 - 7.2.0
string(11) "Nuevo León" string(11) "NUEVO LEÓN"
Output for 4.3.0 - 5.5.35
string(11) "Nuevo León" string(11) "NUEVO LEóN"