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run code in 200+ php & hhvm versions
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<?php $m = "Thaís Amanda de Sousa"; var_dump(utf8_decode($m), utf8_decode(utf8_decode($m)));
based on 1PeBX
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.6
string(21) "Tha�s Amanda de Sousa" string(21) "Tha?s Amanda de Sousa"