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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 332598 $ -->
<refentry xml:id="mongocollection.toindexstring" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
<refnamediv>
<refname>MongoCollection::toIndexString</refname>
<refpurpose>Converts keys specifying an index to its identifying string</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<modifier>static protected</modifier> <type>string</type><methodname>MongoCollection::toIndexString</methodname>
<methodparam><type>mixed</type><parameter>keys</parameter></methodparam>
</methodsynopsis>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term>
<parameter>keys</parameter>
</term>
<listitem>
<para>
Field or fields to convert to the identifying string
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns a string that describes the index.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<example>
<title><function>MongoCollection::toIndexString</function> example</title>
<para>This example shows how you can create an index name out of of keys.
Because this is a protected (static) method, you need to overload it in a
child class first.</para>
<programlisting role="php">
<![CDATA[
<?php
// Create inherited class to make the method "public".
class MyCollection extends MongoCollection
{
static public function toIndexString($a)
{
return parent::toIndexString($a);
}
}
echo MyCollection::toIndexString("foo"), "\n";
// Outputs: foo_1
echo MyCollection::toIndexString(array('name' => 1, 'age' => -1)), "\n";
// Outputs: name_1_age_-1
?>
]]>
</programlisting>
</example>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
MongoDB core docs on <link xlink:href="&url.mongodb.dochub.indexes;">indexes</link>.
</para>
</refsect1>
</refentry>
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