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:
        | 
    
     See also
     mysql_ping() and
     mysql_list_processes().