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<?php print_r(mb_detect_order());
Output for 4.3.4 - 7.2.0
Array ( [0] => ASCII [1] => UTF-8 )
Output for 4.3.0 - 4.3.3
Array ( [0] => ASCII [1] => JIS [2] => UTF-8 [3] => EUC-JP [4] => SJIS )