   #PHP Manual MySQL Functions mysql_tablename mysql_unbuffered_query

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                                mysql_thread_id

   (PHP 4 >= 4.3.0)
   mysql_thread_id -- Return the current thread ID

Description

   int mysql_thread_id ( [resource link_identifier])

   mysql_thread_id() returns the current thread ID. If the connection is
   lost and you reconnect with mysql_ping(), 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.

   Example 1. mysql_thread_id() example
   <?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);
   }
   ?>

   The above example would produce the following output:
   current thread id is 73

   See also mysql_ping() and mysql_list_processes().
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