Copyright 1997-2022 the PHP Documentation Group.
mysqli::$thread_id
mysqli_thread_id
Returns the thread ID for the current connection
Description
Object-oriented style
int mysqli->thread_id ;
Procedural style
int mysqli_thread_id(mysqli mysql);
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.
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
-
mysql
Procedural style only: A
mysqli
object returned bymysqli_connect
ormysqli_init
Return Values
Returns the Thread ID for the current connection.
Examples
Example 7.74 $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_kill
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