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run code in 200+ php & hhvm versions
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<?php var_dump(html_entity_decode("&#39;"));
based on jWbfK
Output for 4.3.0 - 4.4.9, 5.0.5 - 7.2.0
string(5) "&#39;"
Output for 5.0.0 - 5.0.4
string(1) "'"