php - How to convert htmlspecialchars into normal text? -

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I have a mySQL database and I am using special character of html to format text before the inclusion. .. I have found: $ firstname = htmlspecialchars ("O'brian", ENT_QUOTES, 'UTF-8');

And if I resonate $ firstname; I O & amp; # 039; Brian

How can I convert back to normal text?

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