php-doc-en/reference/mbstring/http-inout.xml

<?xml version="1.0" encoding="utf-8"?>
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<chapter xml:id="mbstring.http" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <title>HTTP Input and Output</title>
 <para>
  HTTP input/output character encoding conversion may convert
  binary data also. Users are supposed to control character
  encoding conversion if binary data is used for HTTP
  input/output.
 </para>
 <note>
  <para>
   In PHP 4.3.2 or earlier versions, there was a limitation in this
   functionality that <literal>mbstring</literal> does not perform
   character encoding conversion in POST data if the
   <literal>enctype</literal> attribute in the <literal>form</literal>
   element is set to <literal>multipart/form-data</literal>.
   So you have to convert the incoming data by yourself in this case
   if necessary.
  </para>
  <para>
   Beginning with PHP 4.3.3, if <literal>enctype</literal> for HTML form is
   set to <literal>multipart/form-data</literal> and
   <literal>mbstring.encoding_translation</literal> is set to On
   in &php.ini; the POST'ed variables and the names of uploaded files
   will be converted to the internal character encoding as well.
   However, the conversion isn't applied to the query keys.
  </para>
 </note>
 <para>
  <itemizedlist>
   <listitem>
    <simpara>
     HTTP Input
    </simpara>
    <para> 
     There is no way to control HTTP input character
     conversion from a PHP script. To disable HTTP input character
     conversion, it has to be done in &php.ini;.
     <example>
      <title>
       Disable HTTP input conversion in &php.ini;
      </title>
      <programlisting role="php.ini">
<![CDATA[
;; Disable HTTP Input conversion
mbstring.http_input = pass
;; Disable HTTP Input conversion (PHP 4.3.0 or higher)
mbstring.encoding_translation = Off
]]>
      </programlisting>
     </example>
    </para>
    <para>
     When using PHP as an Apache module, it is possible to
     override those settings in each Virtual Host directive in
     &httpd.conf; or per directory with &htaccess;. Refer to the <link
      linkend="configuration">Configuration</link> section and
     Apache Manual for details.
    </para>
   </listitem>
   <listitem>
    <simpara>
     HTTP Output
    </simpara>
    <para>
     There are several ways to enable output character encoding
     conversion. One is using &php.ini;, another
     is using <function>ob_start</function> with
     <function>mb_output_handler</function> as the 
     <literal>ob_start</literal> callback function.
    </para>
   </listitem>
  </itemizedlist>
 </para>
 <para>
  <example>
   <title>&php.ini; setting example</title>
   <programlisting>
<![CDATA[
;; Enable output character encoding conversion for all PHP pages

;; Enable Output Buffering
output_buffering    = On

;; Set mb_output_handler to enable output conversion
output_handler      = mb_output_handler
]]>
   </programlisting>
  </example>
 </para>
 <para>
  <example>
   <title>Script example</title>
   <programlisting role="php">
<![CDATA[
<?php

// Enable output character encoding conversion only for this page

// Set HTTP output character encoding to SJIS
mb_http_output('SJIS');

// Start buffering and specify "mb_output_handler" as
// callback function
ob_start('mb_output_handler');

?>
]]>
   </programlisting>
  </example>
 </para>
</chapter>

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