php man page for mysqli_thread_id

MYSQLI_THREAD_ID(3)							 1						       MYSQLI_THREAD_ID(3)

mysqli::$thread_id - Returns the thread ID for the current connection

       Object oriented style

SYNOPSIS
       int$mysqli->thread_id ()

DESCRIPTION
       Procedural style
       int mysqli_thread_id (mysqli  $link)

	The  mysqli_thread_id(3) function returns the thread ID for the current connection which can then be killed using the mysqli_kill(3) func-
       tion. If the connection is lost and you reconnect with mysqli_ping(3), the thread ID will be other. Therefore you should get the thread	ID
       only when you need it.

       Note

	       The  thread  ID	is  assigned on a connection-by-connection basis. Hence, if the connection is broken and then re-established a new
	      thread ID will be assigned.

	       To kill a running query you can use the SQL command KILL QUERY processid.

PARAMETERS
	      o $
		link -Procedural style only: A link identifier returned by mysqli_connect(3) or mysqli_init(3)

RETURN VALUES
	Returns the Thread ID for the current connection.

EXAMPLES
       Example #1

	      $mysqli->thread_id example

	      Object oriented style

	      <?php
	      $mysqli = new mysqli("localhost", "my_user", "my_password", "world");

	      /* check connection */
	      if (mysqli_connect_errno()) {
		  printf("Connect failed: %s
", mysqli_connect_error());
		  exit();
	      }

	      /* determine our thread id */
	      $thread_id = $mysqli->thread_id;

	      /* Kill connection */
	      $mysqli->kill($thread_id);

	      /* This should produce an error */
	      if (!$mysqli->query("CREATE TABLE myCity LIKE City")) {
		  printf("Error: %s
", $mysqli->error);
		  exit;
	      }

	      /* close connection */
	      $mysqli->close();
	      ?>

	      Procedural style

	      <?php
	      $link = mysqli_connect("localhost", "my_user", "my_password", "world");

	      /* check connection */
	      if (mysqli_connect_errno()) {
		  printf("Connect failed: %s
", mysqli_connect_error());
		  exit();
	      }

	      /* determine our thread id */
	      $thread_id = mysqli_thread_id($link);

	      /* Kill connection */
	      mysqli_kill($link, $thread_id);

	      /* This should produce an error */
	      if (!mysqli_query($link, "CREATE TABLE myCity LIKE City")) {
		  printf("Error: %s
", mysqli_error($link));
		  exit;
	      }

	      /* close connection */
	      mysqli_close($link);
	      ?>

	      The above examples will output:

	      Error: MySQL server has gone away

SEE ALSO
       mysqli_kill(3).

PHP Documentation Group 												       MYSQLI_THREAD_ID(3)