The behaviour of these functions is affected by settings in php.ini.
Name | Default | Changeable | Changelog |
---|---|---|---|
mbstring.language | "neutral" | PHP_INI_ALL | |
mbstring.detect_order | NULL | PHP_INI_ALL | |
mbstring.http_input | "pass" | PHP_INI_ALL | Deprecated |
mbstring.http_output | "pass" | PHP_INI_ALL | Deprecated |
mbstring.internal_encoding | NULL | PHP_INI_ALL | Deprecated |
mbstring.substitute_character | NULL | PHP_INI_ALL | |
mbstring.func_overload | "0" | PHP_INI_SYSTEM | Deprecated as of PHP 7.2.0; removed as of PHP 8.0.0. |
mbstring.encoding_translation | "0" | PHP_INI_PERDIR | |
mbstring.http_output_conv_mimetypes | "^(text/|application/xhtml\+xml)" | PHP_INI_ALL | |
mbstring.strict_detection | "0" | PHP_INI_ALL | |
mbstring.regex_retry_limit | "1000000" | PHP_INI_ALL | Available as of PHP 7.4.0. |
mbstring.regex_stack_limit | "100000" | PHP_INI_ALL | Available as of PHP 7.3.5. |
Here's a short explanation of the configuration directives.
mbstring.language
string
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_translation
bool
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_encoding
string
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_input
string
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_output
string
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_order
string
Defines default character code detection order. See also mb_detect_order().
mbstring.substitute_character
string
Defines character to substitute for invalid character encoding. See mb_substitute_character() for supported values.
mbstring.func_overload
string
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_mimetypes
string
mbstring.strict_detection
bool
Enables strict encoding detection. See mb_detect_encoding() for a description and examples.
mbstring.regex_retry_limit
int
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_limit
int
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.
Example #1 php.ini setting examples
; 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
Example #2 php.ini setting for EUC-JP
users
;; 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
Example #3 php.ini setting for SJIS
users
;; 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