Runtime Configuration

The behaviour of these functions is affected by settings in php.ini.

Here's a short explanation of the configuration directives.

mbstring.languagestring

The default national language setting (NLS) used in mbstring. Note that this option automagically defines mbstring.internal_encoding and mbstring.internal_encoding should be placed after mbstring.language in php.ini

mbstring.encoding_translationbool

Enables the transparent character encoding filter for the incoming HTTP queries, which performs detection and conversion of the input encoding to the internal character encoding.

mbstring.internal_encodingstring

Warning

This deprecated feature will certainly be removed in the future.

Defines the default internal character encoding.

Users should leave this empty and set default_charset instead.

mbstring.http_inputstring

Warning

This deprecated feature will certainly be removed in the future.

Defines the default HTTP input character encoding.

Users should leave this empty and set default_charset instead.

mbstring.http_outputstring

Warning

This deprecated feature will certainly be removed in the future.

Defines the default HTTP output character encoding (output will be converted from the internal encoding to the HTTP output encoding upon output).

Users should leave this empty and set default_charset instead.

mbstring.detect_orderstring

Defines default character code detection order. See also mb_detect_order().

mbstring.substitute_characterstring

Defines character to substitute for invalid character encoding. See mb_substitute_character() for supported values.

mbstring.func_overloadstring

Warning

This feature has been DEPRECATED as of PHP 7.2.0, and REMOVED as of PHP 8.0.0. Relying on this feature is highly discouraged.

Overloads a set of single byte functions by the mbstring counterparts. See Function overloading for more information.

This setting can only be changed from the php.ini file.

mbstring.http_output_conv_mimetypesstring

mbstring.strict_detectionbool

Enables strict encoding detection. See mb_detect_encoding() for a description and examples.

mbstring.regex_retry_limitint

Limits the amount of backtracking that may be performed during one mbregex match.

This setting only takes effect when linking against oniguruma >= 6.8.0.

mbstring.regex_stack_limitint

Limits the stack depth of mbstring regular expressions.

According to the » HTML 4.01 specification, Web browsers are allowed to encode a form being submitted with a character encoding different from the one used for the page. See mb_http_input() to detect character encoding used by browsers.

Although popular browsers are capable of giving a reasonably accurate guess to the character encoding of a given HTML document, it would be better to set the charset parameter in the Content-Type HTTP header to the appropriate value by header() or default_charset ini setting.

 ; Set default language mbstring.language = Neutral; Set default language to Neutral(UTF-8) (default) mbstring.language = English; Set default language to English mbstring.language = Japanese; Set default language to Japanese ;; Set default internal encoding ;; Note: Make sure to use character encoding works with PHP mbstring.internal_encoding = UTF-8 ; Set internal encoding to UTF-8 ;; HTTP input encoding translation is enabled. mbstring.encoding_translation = On ;; Set default HTTP input character encoding ;; Note: Script cannot change http_input setting. mbstring.http_input = pass ; No conversion. mbstring.http_input = auto ; Set HTTP input to auto ; "auto" is expanded according to mbstring.language mbstring.http_input = SJIS ; Set HTTP input to SJIS mbstring.http_input = UTF-8,SJIS,EUC-JP ; Specify order ;; Set default HTTP output character encoding mbstring.http_output = pass ; No conversion mbstring.http_output = UTF-8 ; Set HTTP output encoding to UTF-8 ;; Set default character encoding detection order mbstring.detect_order = auto ; Set detect order to auto mbstring.detect_order = ASCII,JIS,UTF-8,SJIS,EUC-JP ; Specify order ;; Set default substitute character mbstring.substitute_character = 12307 ; Specify Unicode value mbstring.substitute_character = none ; Do not print character mbstring.substitute_character = long ; Long Example: U+3000,JIS+7E7E 

 ;; Disable Output Buffering output_buffering = Off ;; Set HTTP header charset default_charset = EUC-JP ;; Set default language to Japanese mbstring.language = Japanese ;; HTTP input encoding translation is enabled. mbstring.encoding_translation = On ;; Set HTTP input encoding conversion to auto mbstring.http_input = auto ;; Convert HTTP output to EUC-JP mbstring.http_output = EUC-JP ;; Set internal encoding to EUC-JP mbstring.internal_encoding = EUC-JP ;; Do not print invalid characters mbstring.substitute_character = none 

 ;; Enable Output Buffering output_buffering = On ;; Set mb_output_handler to enable output conversion output_handler = mb_output_handler ;; Set HTTP header charset default_charset = Shift_JIS ;; Set default language to Japanese mbstring.language = Japanese ;; Set http input encoding conversion to auto mbstring.http_input = auto ;; Convert to SJIS mbstring.http_output = SJIS ;; Set internal encoding to EUC-JP mbstring.internal_encoding = EUC-JP ;; Do not print invalid characters mbstring.substitute_character = none