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<h1 class="refname">socket_write</h1>
<p class="verinfo">(PHP 4 >= 4.1.0, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">socket_write</span> — <span class="dc-title">Write to a socket</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.socket-write-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">int</span> <span class="methodname"><strong>socket_write</strong></span>
( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$socket</code></span>
, <span class="methodparam"><span class="type">string</span> <code class="parameter">$buffer</code></span>
[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$length</code><span class="initializer"> = 0</span></span>
] )</div>
<p class="para rdfs-comment">
The function <span class="function"><strong>socket_write()</strong></span> writes to the
<code class="parameter">socket</code> from the given
<code class="parameter">buffer</code>.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.socket-write-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<code class="parameter">socket</code></dt>
<dd>
<p class="para">
</p>
</dd>
<dt>
<code class="parameter">buffer</code></dt>
<dd>
<p class="para">
The buffer to be written.
</p>
</dd>
<dt>
<code class="parameter">length</code></dt>
<dd>
<p class="para">
The optional parameter <code class="parameter">length</code> can specify an
alternate length of bytes written to the socket. If this length is
greater than the buffer length, it is silently truncated to the length
of the buffer.
</p>
</dd>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.socket-write-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns the number of bytes successfully written to the socket or <strong><code>FALSE</code></strong> on failure.
The error code can be retrieved with
<span class="function"><a href="function.socket-last-error.html" class="function">socket_last_error()</a></span>. This code may be passed to
<span class="function"><a href="function.socket-strerror.html" class="function">socket_strerror()</a></span> to get a textual explanation of the
error.
</p>
<blockquote class="note"><p><strong class="note">Note</strong>:
<p class="para">
It is perfectly valid for <span class="function"><strong>socket_write()</strong></span> to
return zero which means no bytes have been written. Be sure to use the
<em>===</em> operator to check for <strong><code>FALSE</code></strong> in case of an
error.
</p>
</p></blockquote>
</div>
<div class="refsect1 notes" id="refsect1-function.socket-write-notes">
<h3 class="title">Notes</h3>
<blockquote class="note"><p><strong class="note">Note</strong>:
<p class="para">
<span class="function"><strong>socket_write()</strong></span> does not necessarily write all bytes
from the given buffer. It's valid that, depending on the network
buffers etc., only a certain amount of data, even one byte, is written
though your buffer is greater. You have to watch out so you don't
unintentionally forget to transmit the rest of your data.
</p>
</p></blockquote>
</div>
<div class="refsect1 seealso" id="refsect1-function.socket-write-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"><span class="function"><a href="function.socket-accept.html" class="function" rel="rdfs-seeAlso">socket_accept()</a> - Accepts a connection on a socket</span></li>
<li class="member"><span class="function"><a href="function.socket-bind.html" class="function" rel="rdfs-seeAlso">socket_bind()</a> - Binds a name to a socket</span></li>
<li class="member"><span class="function"><a href="function.socket-connect.html" class="function" rel="rdfs-seeAlso">socket_connect()</a> - Initiates a connection on a socket</span></li>
<li class="member"><span class="function"><a href="function.socket-listen.html" class="function" rel="rdfs-seeAlso">socket_listen()</a> - Listens for a connection on a socket</span></li>
<li class="member"><span class="function"><a href="function.socket-read.html" class="function" rel="rdfs-seeAlso">socket_read()</a> - Reads a maximum of length bytes from a socket</span></li>
<li class="member"><span class="function"><a href="function.socket-strerror.html" class="function" rel="rdfs-seeAlso">socket_strerror()</a> - Return a string describing a socket error</span></li>
</ul>
</p>
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