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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.5 $ -->
<!-- splitted from ./en/functions/strings.xml, last change in rev 1.2 -->
<refentry id="function.soundex">
<refnamediv>
<refname>soundex</refname>
<refpurpose>Calculate the soundex key of a string</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<methodsynopsis>
<type>string</type><methodname>soundex</methodname>
<methodparam><type>string</type><parameter>str</parameter></methodparam>
</methodsynopsis>
<para>
Calculates the soundex key of <parameter>str</parameter>.
</para>
<para>
Soundex keys have the property that words pronounced similarly
produce the same soundex key, and can thus be used to simplify
searches in databases where you know the pronunciation but not
the spelling. This soundex function returns a string 4 characters
long, starting with a letter.
</para>
<para>
This particular soundex function is one described by Donald Knuth
in "The Art Of Computer Programming, vol. 3: Sorting And
Searching", Addison-Wesley (1973), pp. 391-392.
</para>
<para>
<example>
<title>Soundex Examples</title>
<programlisting role="php">
<![CDATA[
<?php
soundex("Euler") == soundex("Ellery"); // E460
soundex("Gauss") == soundex("Ghosh"); // G200
soundex("Hilbert") == soundex("Heilbronn"); // H416
soundex("Knuth") == soundex("Kant"); // K530
soundex("Lloyd") == soundex("Ladd"); // L300
soundex("Lukasiewicz") == soundex("Lissajous"); // L222
?>
]]>
</programlisting>
</example>
</para>
<para>
See also
<function>levenshtein</function>,
<function>metaphone</function>, and
<function>similar_text</function>.
</para>
</refsect1>
</refentry>
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