php-doc-en/reference/mbstring/functions/mb-check-encoding.xml

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<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>
     </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>8.0.0</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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