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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.socket-write" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>socket_write</refname>
<refpurpose>Write to a socket</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type class="union"><type>int</type><type>false</type></type><methodname>socket_write</methodname>
<methodparam><type>Socket</type><parameter>socket</parameter></methodparam>
<methodparam><type>string</type><parameter>data</parameter></methodparam>
<methodparam choice="opt"><type class="union"><type>int</type><type>null</type></type><parameter>length</parameter><initializer>&null;</initializer></methodparam>
</methodsynopsis>
<para>
The function <function>socket_write</function> writes to the
<parameter>socket</parameter> from the given
<parameter>data</parameter>.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>socket</parameter></term>
<listitem>
<para>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>data</parameter></term>
<listitem>
<para>
The buffer to be written.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>length</parameter></term>
<listitem>
<para>
The optional parameter <parameter>length</parameter> can specify an
alternate length of bytes written to the socket. If this length is
greater than <parameter>data</parameter>'s length,
it is silently truncated to the length of <parameter>data</parameter>.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns the number of bytes successfully written to the socket&return.falseforfailure;.
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>
<note>
<para>
It is perfectly valid for <function>socket_write</function> to
return zero which means no bytes have been written. Be sure to use the
<literal>===</literal> operator to check for &false; in case of an
error.
</para>
</note>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
&sockets.changelog.socket-param;
<row>
<entry>8.0.0</entry>
<entry>
<parameter>length</parameter> is nullable now.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</refsect1>
<refsect1 role="notes">
&reftitle.notes;
<note>
<para>
<function>socket_write</function> does not necessarily write all bytes
from <parameter>data</parameter>. It's valid that, depending on the network
buffers etc., only a certain amount of data, even one byte, is written
despite <parameter>data</parameter> being longer.
A loop must be used to ensure that the rest of <parameter>data</parameter>
is transmitted.
</para>
</note>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>socket_accept</function></member>
<member><function>socket_bind</function></member>
<member><function>socket_connect</function></member>
<member><function>socket_listen</function></member>
<member><function>socket_read</function></member>
<member><function>socket_strerror</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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