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Set/Get character encoding detection order (PHP 4 >= 4.0.6, PHP 5)
mixed mb_detect_order ( [mixed encoding_list] )

mb_detect_order() sets automatic character encoding detection order to encoding_list. It returns TRUE for success, FALSE for failure.

encoding_list is array or comma separated list of character encoding. ("auto" is expanded to "ASCII, JIS, UTF-8, EUC-JP, SJIS")

If encoding_list is omitted, it returns current character encoding detection order as array.

This setting affects mb_detect_encoding() and mb_send_mail().


mbstring currently implements following encoding detection filters. If there is an invalid byte sequence for following encoding, encoding detection will fail.

UTF-8, UTF-7, ASCII, EUC-JP,SJIS, eucJP-win, SJIS-win, JIS, ISO-2022-JP

For ISO-8859-*, mbstring always detects as ISO-8859-*.

For UTF-16, UTF-32, UCS2 and UCS4, encoding detection will fail always.

Example 1397. Useless detect order example

; Always detect as ISO-8859-1
detect_order = ISO-8859-1, UTF-8

; Always detect as UTF-8, since ASCII/UTF-7 values are
; valid for UTF-8
detect_order = UTF-8, ASCII, UTF-7

Example 1398. mb_detect_order() examples

/* Set detection order by enumerated list */

/* Set detection order by array */
$ary[] = "ASCII";
$ary[] = "JIS";
$ary[] = "EUC-JP";

/* Display current detection order */
echo implode(", ", mb_detect_order());

See also mb_internal_encoding(), mb_http_input(), mb_http_output() and mb_send_mail().