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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.mb-check-encoding" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
<refnamediv>
<refname>mb_check_encoding</refname>
<refpurpose>Check if strings are valid for the specified encoding</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>bool</type><methodname>mb_check_encoding</methodname>
<methodparam choice="opt"><type class="union"><type>array</type><type>string</type><type>null</type></type><parameter>value</parameter><initializer>&null;</initializer></methodparam>
<methodparam choice="opt"><type class="union"><type>string</type><type>null</type></type><parameter>encoding</parameter><initializer>&null;</initializer></methodparam>
</methodsynopsis>
<para>
Checks if the specified byte stream is valid for the specified encoding.
If <parameter>value</parameter> is of type &array;, all keys and values are
validated recursively.
It is useful to prevent so-called "Invalid Encoding Attack".
</para>
<para>
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>value</parameter></term>
<listitem>
<para>
The byte stream or &array; to check. If it is omitted, this function checks
all the input from the beginning of the request.
</para>
<warning>
<para>
As of PHP 8.1.0, omitting this parameter or passing &null; is deprecated.
</para>
</warning>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>encoding</parameter></term>
<listitem>
<para>
The expected encoding.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
&return.success;
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>8.1.0</entry>
<entry>
Calling this function with &null; as <parameter>value</parameter> or without argument is deprecated.
</entry>
</row>
<row>
<entry>8.0.0</entry>
<entry>
<parameter>value</parameter> and <parameter>encoding</parameter> are nullable now.
</entry>
</row>
<row>
<entry>7.2.0</entry>
<entry>
This function now also accepts an &array; as <parameter>value</parameter>.
Formerly, only &string;s have been supported.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</refsect1>
</refentry>
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