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<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.metaphone">
 <refnamediv>
  <refname>metaphone</refname>
  <refpurpose>Calculate the metaphone key of a string</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>string</type><methodname>metaphone</methodname>
   <methodparam><type>string</type><parameter>str</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>phones</parameter></methodparam>
  </methodsynopsis>
  <para>
   Calculates the metaphone key of <parameter>str</parameter>.
  </para>
  <para>
   Similar to <function>soundex</function> metaphone creates the same key for
   similar sounding words. It's more accurate than
   <function>soundex</function> as it knows the basic rules of English
   pronunciation.  The metaphone generated keys are of variable length.
  </para>
  <para>
   Metaphone was developed by Lawrence Philips
   &lt;lphilips at verity dot com>. It is described in ["Practical
   Algorithms for Programmers", Binstock &amp; Rex, Addison Wesley,
   1995].
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>str</parameter></term>
     <listitem>
      <para>
       The input string.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>phones</parameter></term>
     <listitem>
      <para>
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns the metaphone key as a string.
  </para>
 </refsect1>

</refentry>

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