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<title>Return the current thread ID</title>
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<div class="refnamediv">
<h1 class="refname">mysql_thread_id</h1>
<p class="verinfo">(PHP 4 >= 4.3.0, PHP 5)</p><p class="refpurpose"><span class="refname">mysql_thread_id</span> — <span class="dc-title">Return the current thread ID</span></p>
</div>
<div id="function.mysql-thread-id-refsynopsisdiv">
<div class="warning"><strong class="warning">Warning</strong>
<p class="para">This extension is deprecated as of PHP 5.5.0, and will be removed in the future.
Instead, the <a href="book.mysqli.html" class="link">MySQLi</a> or <a href="ref.pdo-mysql.html" class="link">PDO_MySQL</a> extension should be used.
See also <a href="mysqlinfo.api.choosing.html" class="link">MySQL: choosing an API</a> guide and
<a href="faq.databases.html#faq.databases.mysql.deprecated" class="link">related FAQ</a> for more information.
Alternatives to this function include:</p>
<ul class="simplelist">
<li class="member"> <span class="function"><a href="mysqli.thread-id.html" class="function">mysqli_thread_id()</a></span></li>
</ul>
</div>
</div>
<div class="refsect1 description" id="refsect1-function.mysql-thread-id-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">int</span> <span class="methodname"><strong>mysql_thread_id</strong></span>
([ <span class="methodparam"><span class="type">resource</span> <code class="parameter">$link_identifier</code><span class="initializer"> = NULL</span></span>
] )</div>
<p class="para rdfs-comment">
Retrieves the current thread ID. If the connection is lost, and a reconnect
with <span class="function"><a href="function.mysql-ping.html" class="function">mysql_ping()</a></span> is executed, the thread ID will
change. This means only retrieve the thread ID when needed.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.mysql-thread-id-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<span class="term"><em><code class="parameter">
link_identifier</code></em></span><dd>
<p class="para">The MySQL connection. If the
link identifier is not specified, the last link opened by
<span class="function"><a href="function.mysql-connect.html" class="function">mysql_connect()</a></span> is assumed. If no such link is found, it
will try to create one as if <span class="function"><a href="function.mysql-connect.html" class="function">mysql_connect()</a></span> was called
with no arguments. If no connection is found or established, an
<strong><code>E_WARNING</code></strong> level error is generated.</p></dd>
</dt>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.mysql-thread-id-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
The thread ID on success or <strong><code>FALSE</code></strong> on failure.
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.mysql-thread-id-examples">
<h3 class="title">Examples</h3>
<p class="para">
<div class="example" id="example-1617">
<p><strong>Example #1 <span class="function"><strong>mysql_thread_id()</strong></span> example</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br />$link </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">'localhost'</span><span style="color: #007700">, </span><span style="color: #DD0000">'mysql_user'</span><span style="color: #007700">, </span><span style="color: #DD0000">'mysql_password'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$thread_id </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_thread_id</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">);<br />if (</span><span style="color: #0000BB">$thread_id</span><span style="color: #007700">){<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"current thread id is %d\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">$thread_id</span><span style="color: #007700">);<br />}<br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
<div class="example-contents"><p>The above example will output
something similar to:</p></div>
<div class="example-contents screen">
<div class="cdata"><pre>
current thread id is 73
</pre></div>
</div>
</div>
</p>
</div>
<div class="refsect1 seealso" id="refsect1-function.mysql-thread-id-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"> <span class="function"><a href="function.mysql-ping.html" class="function" rel="rdfs-seeAlso">mysql_ping()</a> - Ping a server connection or reconnect if there is no connection</span></li>
<li class="member"> <span class="function"><a href="function.mysql-list-processes.html" class="function" rel="rdfs-seeAlso">mysql_list_processes()</a> - List MySQL processes</span></li>
</ul>
</p>
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