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PHP

Runtime Configuration


Runtime Configuration

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

mbstring configuration options
Name Default Changeable Changelog
mbstring.language "neutral" PHP_INI_ALL Available since PHP 4.3.0.; PHP_INI_PERDIR in PHP <= 5.2.6
mbstring.detect_order NULL PHP_INI_ALL Available since PHP 4.0.6.
mbstring.http_input "pass" PHP_INI_ALL Available since PHP 4.0.6.
mbstring.http_output "pass" PHP_INI_ALL Available since PHP 4.0.6.
mbstring.internal_encoding NULL PHP_INI_ALL Available since PHP 4.0.6.
mbstring.script_encoding NULL PHP_INI_ALL Available since PHP 4.3.0.
mbstring.substitute_character NULL PHP_INI_ALL Available since PHP 4.0.6.
mbstring.func_overload "0" PHP_INI_SYSTEM PHP_INI_SYSTEM in PHP <= 4.2.3; PHP_INI_SYSTEM | PHP_INI_PERDIR from PHP 4.3 through 5.2.6. Available since PHP 4.2.0.
mbstring.encoding_translation "0" PHP_INI_PERDIR Available since PHP 4.3.0.
mbstring.strict_detection "0" PHP_INI_ALL Available since PHP 5.1.2.
For further details and definitions of the PHP_INI_* modes, see the Where a configuration setting may be set.

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 boolean

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

Defines the default internal character encoding.

mbstring.http_input string

Defines the default HTTP input character encoding.

mbstring.http_output string

Defines the default HTTP output character encoding.

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.

mbstring.func_overload string

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

mbstring.strict_detection boolean

Enables the strict encoding detection.

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 



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