PHP Manual
Prev |  | Next

# mysqli_thread_id

(PHP 5)

mysqli_thread_id

(no version information, might be only in CVS)

mysqli->thread_id -- Returns the thread ID for the current connection

## Description

Procedural style:

int mysqli_thread_id ( mysqli link )

Object oriented style (property):

class mysqli {
int thread_id
}

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.

## Return Values

mysqli_thread_id() returns the Thread ID for the current connection.

## See Also

mysqli_kill().

## Examples

Example 1. 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(); ?>`

Example 2. 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 example will output:

    Error: MySQL server has gone away

Prev | Home | Next
mysqli_store_result | Up | mysqli_thread_safe