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<!DOCTYPE html> <html> <body> <?php $str = "Albert Einstein said: 'E=MC�'"; echo htmlentities($str, ENT_COMPAT); echo "<br>"; echo htmlentities($str, ENT_QUOTES); echo "<br>"; echo htmlentities($str, ENT_NOQUOTES); ?> </body> </html>
Albert Einstein said: 'E=MC²'
Albert Einstein said: 'E=MC²'
Albert Einstein said: 'E=MC²'
