mysqli
PHP Manual

mysqli::$thread_id

mysqli_thread_id

(PHP 5)

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

Description

Object oriented style

Procedural style

int mysqli_thread_id ( mysqli $link )

The mysqli_thread_id() function returns the thread ID for the current connection which can then be killed using the mysqli_kill() function. If the connection is lost and you reconnect with mysqli_ping(), 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

link

Procedural style only: A link identifier returned by mysqli_connect() or mysqli_init()

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\n"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\n"$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\n"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\n"mysqli_error($link));
    exit;
}

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

The above examples will output:

Error: MySQL server has gone away

See Also


mysqli
PHP Manual

copyright  ©  February 23 2020 sean dreilinger url: https://durak.org/sean/pubs/software/php-7.0.0/mysqli.thread-id.html