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<?php $s = 'űáéúüó'; $d = htmlspecialchars($s); var_dump(mb_detect_encoding($s)); var_dump(mb_detect_encoding($d), $d);
Output for 4.3.0 - 7.1.0
string(5) "UTF-8" string(5) "UTF-8" string(12) "űáéúüó"