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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 317827 $ -->
<refentry xml:id="streamwrapper.stream-seek" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
<refnamediv>
<refname>streamWrapper::stream_seek</refname>
<refpurpose>Seeks to specific location in a stream</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<modifier>public</modifier> <type>bool</type><methodname>streamWrapper::stream_seek</methodname>
<methodparam><type>int</type><parameter>offset</parameter></methodparam>
<methodparam><type>int</type><parameter>whence</parameter> <initializer>SEEK_SET</initializer></methodparam>
</methodsynopsis>
<para>
This method is called in response to <function>fseek</function>.
</para>
<para>
The read/write position of the stream should be updated according to the
<parameter>offset</parameter> and <parameter>whence</parameter>.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>offset</parameter></term>
<listitem>
<para>
The stream offset to seek to.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>whence</parameter></term>
<listitem>
<para>
Possible values:
<simplelist>
<member><constant>SEEK_SET</constant> - Set position equal to <parameter>offset</parameter> bytes.</member>
<member><constant>SEEK_CUR</constant> - Set position to current location plus <parameter>offset</parameter>.</member>
<member><constant>SEEK_END</constant> - Set position to end-of-file plus <parameter>offset</parameter>.</member>
</simplelist>
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Return &true; if the position was updated, &false; otherwise.
</para>
</refsect1>
<!--
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>streamWrapper::stream_seek</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
/* ... */
?>
]]>
</programlisting>
&example.outputs.similar;
<screen>
<![CDATA[
...
]]>
</screen>
</example>
</para>
</refsect1>
-->
<refsect1 role="notes"><!-- {{{ -->
&reftitle.notes;
<note>
<para>
If not implemented, &false; is assumed as the return value.
</para>
</note>
<note>
<para>
Upon success,
<methodname>streamWrapper::stream_tell</methodname> is called directly after
calling <methodname>streamWrapper::stream_seek</methodname>. If
<methodname>streamWrapper::stream_tell</methodname> fails, the return
value to the caller function will be set to &false;
</para>
</note>
<note>
<para>
Not all seeks operations on the stream will result in this function being
called. PHP streams have read buffering enabled by default (see also
<function>stream_set_read_buffer</function>) and seeking may be done by
merely moving the buffer pointer.
</para>
</note>
</refsect1><!-- }}} -->
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>fseek</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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