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run code in 150+ php & hhvm versions
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<?php $valor = "João dos Santos Videira"; echo str_replace(" ","_",preg_replace("/&([a-z])[a-z]+;/i", "$1", htmlentities(trim($valor))));
Output for 5.4.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Joao_dos_Santos_Videira
Output for 4.3.0 - 5.3.29
JoApo_dos_Santos_Videira