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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 304160 $ -->
<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.socket-bind">
<refnamediv>
<refname>socket_bind</refname>
<refpurpose>Binds a name to a socket</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>bool</type><methodname>socket_bind</methodname>
<methodparam><type>resource</type><parameter>socket</parameter></methodparam>
<methodparam><type>string</type><parameter>address</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>port</parameter><initializer>0</initializer></methodparam>
</methodsynopsis>
<para>
Binds the name given in <parameter>address</parameter> to the socket
described by <parameter>socket</parameter>. This has to be done before
a connection is be established using <function>socket_connect</function>
or <function>socket_listen</function>.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>socket</parameter></term>
<listitem>
<para>
A valid socket resource created with <function>socket_create</function>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>address</parameter></term>
<listitem>
<para>
If the socket is of the <constant>AF_INET</constant> family, the
<parameter>address</parameter> is an IP in dotted-quad notation
(e.g. <literal>127.0.0.1</literal>).
</para>
<para>
If the socket is of the <constant>AF_UNIX</constant> family, the
<parameter>address</parameter> is the path of a
Unix-domain socket (e.g. <filename>/tmp/my.sock</filename>).
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>port</parameter> (Optional)</term>
<listitem>
<para>
The <parameter>port</parameter> parameter is only used when
binding an <constant>AF_INET</constant> socket, and designates
the port on which to listen for connections.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
&return.success;
</para>
<para>
The error code can be retrieved with <function>socket_last_error</function>.
This code may be passed to <function>socket_strerror</function> to get a
textual explanation of the error.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title>Using <function>socket_bind</function> to set the source address</title>
<programlisting role="php">
<![CDATA[
<?php
// Create a new socket
$sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
// An example list of IP addresses owned by the computer
$sourceips['kevin'] = '127.0.0.1';
$sourceips['madcoder'] = '127.0.0.2';
// Bind the source address
socket_bind($sock, $sourceips['madcoder']);
// Connect to destination address
socket_connect($sock, '127.0.0.1', 80);
// Write
$request = 'GET / HTTP/1.1' . "\r\n" .
'Host: example.com' . "\r\n\r\n";
socket_write($sock, $request);
// Close
socket_close($sock);
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="notes">
&reftitle.notes;
<note>
<para>
This function must be used on the socket before
<function>socket_connect</function>.
</para>
</note>
<note>
<para>
Windows 9x/ME compatibility note:
<function>socket_last_error</function> may return an invalid error code
if trying to bind the socket to a wrong address that does not belong to
your machine.
</para>
</note>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>socket_connect</function></member>
<member><function>socket_listen</function></member>
<member><function>socket_create</function></member>
<member><function>socket_last_error</function></member>
<member><function>socket_strerror</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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