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<?php // Now everything returns as expected. $str = "foo"; var_dump( mb_detect_encoding($str, 'UTF-8, UTF-8'), // string(5) "UTF-8" mb_detect_encoding($str, 'UTF-8, UTF-8', true) // string(5) "UTF-8" ); $str = "\xf8foo"; var_dump( mb_detect_encoding($str, 'UTF-8, UTF-8'), // bool(false) mb_detect_encoding($str, 'UTF-8, UTF-8', true) // bool(false) ); $str = "foo\xf8"; var_dump( mb_detect_encoding($str, 'UTF-8, UTF-8'), // bool(false) mb_detect_encoding($str, 'UTF-8, UTF-8', true) // bool(false) ); $str = "\xe1\xe9\xf3\xfa"; var_dump( mb_detect_encoding($str, 'UTF-8, UTF-8'), // bool(false) mb_detect_encoding($str, 'UTF-8, UTF-8', true) // bool(false) );
Output for 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.29, 8.0.0 - 8.0.19, 8.1.0 - 8.1.6
string(5) "UTF-8" string(5) "UTF-8" bool(false) bool(false) bool(false) bool(false) bool(false) bool(false)

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