Return the current thread ID

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# mysql_thread_id

(PHP 4 >= 4.3.0, PHP 5)

mysql_thread_id — Return the current thread ID

Warning

This extension was deprecated in PHP 5.5.0, and it was removed in PHP 7.0.0. Instead, the MySQLi or PDO_MySQL extension should be used. See also MySQL: choosing an API guide and related FAQ for more information. Alternatives to this function include:

- mysqli_thread_id()

### Description

int mysql_thread_id ([ resource `$link_identifier` = NULL ] )

Retrieves the current thread ID. If the connection is lost, and a reconnect with mysql_ping() is executed, the thread ID will change. This means only retrieve the thread ID when needed.

### Parameters

`link_identifier`

  The MySQL connection. If the link identifier is not specified, the last link opened by mysql_connect() is assumed. If no such link is found, it will try to create one as if mysql_connect() was called with no arguments. If no connection is found or established, an `E_WARNING` level error is generated.

### Return Values

The thread ID on success or `FALSE` on failure.

### Examples

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 will output something similar to:

    current thread id is 73

### See Also

- mysql_ping() - Ping a server connection or reconnect if there is no connection
- mysql_list_processes() - List MySQL processes

mysql_tablename
mysql_unbuffered_query
MySQL Functions
PHP Manual