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run code in 150+ php & hhvm versions
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<?php //echo htmlspecialchars(html_entity_decode(html_entity_decode('Bob&amp;#39;s dog', ENT_QUOTES), ENT_QUOTES), ENT_QUOTES); echo htmlspecialchars(urldecode('Bob&amp;#39;s dog'), ENT_QUOTES);
Output for 4.3.2 - 7.1.0
Bob&amp;amp;#39;s dog
Output for 4.3.0 - 4.3.1

Process exited with code 139.