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run code in 200+ php & hhvm versions
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<?php echo html_entity_decode('Bob&amp;#39;s dog', ENT_QUOTES);
Output for 4.3.4 - 7.2.0
Bob&#39;s dog
Output for 4.3.2 - 4.3.3
Bob's dog
Output for 4.3.0 - 4.3.1

Process exited with code 139.