php-doc-en/reference/mysql/functions/mysql-thread-id.xml

<?xml version="1.0" encoding="iso-8859-1"?>
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  <refentry id="function.mysql-thread-id">
   <refnamediv>
    <refname>mysql_thread_id</refname>
    <refpurpose>Return the current thread id</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
    <methodsynopsis>
     <type>int</type><methodname>mysql_thread_id</methodname>
     <methodparam choice="opt"><type>resource</type><parameter>link_identifier</parameter></methodparam>
    </methodsynopsis>
    <para>
     <function>mysql_thread_id</function> returns the current thread id. If the connection is lost and you reconnect with <function>mysql_ping</function>, the thread ID will change. This means you should not get the thread ID and store it for later. You should get it when you need it.
    </para>
     <example>
      <title><function>mysql_list_processes</function> example</title>
      <programlisting role="php">
<![CDATA[
<?php
$link = mysql_connect('localhost', 'mysql_user', 'mysql_password');
$thread_id = mysql_thread_id($link);
if ($thread_id){
    printf ("current thread id is %d\n", $thread_id);
}
?>
]]>
      </programlisting>
      <para>
       The above example would produce the following output:
       <screen>
<![CDATA[
current thread id is 73
]]>
       </screen>
      </para>
     </example>
    <para>
     See also:
     <function>mysql_ping</function>,
     <function>mysql_list_processes</function>.
    </para>
   </refsect1>
  </refentry>

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