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  <refentry id="function.metaphone">
   <refnamediv>
    <refname>metaphone</refname>
    <refpurpose>Calculate the metaphone key of a string</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>string</type><methodname>metaphone</methodname>
      <methodparam><type>string</type><parameter>str</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@verity.com>. It is described in ["Practical
     Algorithms for Programmers", Binstock &amp; Rex, Addison Wesley,
     1995].
    </para>
   </refsect1>
  </refentry>

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