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run code in 150+ php & hhvm versions
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<?php $s = '&'; $d = htmlentities($s); var_dump(mb_detect_encoding($s)); var_dump(mb_detect_encoding($d), $d);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(5) "ASCII" string(5) "ASCII" string(5) "&amp;"