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<?php $s = 'űáéúüó&'; $d = htmlentities($s); var_dump(mb_detect_encoding($s)); var_dump(mb_detect_encoding($d), $d);
Output for 5.4.0 - 7.1.0
string(5) "UTF-8" string(5) "UTF-8" string(45) "ű&aacute;&eacute;&uacute;&uuml;&oacute;&amp;"
Output for 4.3.0 - 5.3.29
string(5) "UTF-8" string(5) "ASCII" string(93) "&Aring;&plusmn;&Atilde;&iexcl;&Atilde;&copy;&Atilde;&ordm;&Atilde;&frac14;&Atilde;&sup3;&amp;"