PHP mysqli: thread_id() function
mysqli_thread_id() function / mysqli::$thread_id
The mysqli_thread_id() function / mysqli::$thread_id returns the thread ID for the current connection. The connection can then be killed with the mysqli_kill() function.
Note: If the connection is broken and you reconnect, the thread ID will be changed. Therefore; get the thread ID only when you need it.
Syntax:
Object oriented style
int $mysqli->thread_id;
Procedural style
int mysqli_thread_id ( mysqli $link )
Parameter:
| Name | Description | Required/Optional | |
|---|---|---|---|
| link | A link identifier returned by mysqli_connect() or mysqli_init() | Required for procedural style only and Optional for Object oriented style | |
Usage: Procedural style
mysqli_thread_id(connection);
Parameter:
| Name | Description | Required/Optional |
|---|---|---|
| connection | Specifies the MySQL connection to use. | Required |
Return value:
Returns the Thread ID for the current connection.
Version: PHP 5, PHP 7
Example of object oriented style:
<?php
$mysqli = new mysqli("localhost", "user1", "datasoft123", "hr");
/* 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();
?>
Output:
Error: MySQL server has gone away
Example of the Procedural style
<?php
$link = mysqli_connect("localhost", "user1", "datasoft123", "hr");
/* 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);
?>
Output:
Error: MySQL server has gone away
Example:
<?php
$con=mysqli_connect("localhost","user1","datasoft123","hr");
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
// Get thread id
$t_id=mysqli_thread_id($con);
// Kill connection
mysqli_kill($con,$t_id);
?>
See also
Previous: store_result
Next: thread_safe
PHP: Tips of the Day
To use the constant simply use its name:
Example:
if (EARTH_IS_FLAT) {
print "Earth is flat";
}
print APP_ENV_UPPERCASE;
Output:
or if you don't know the name of the constant in advance, use the constant function:
// this code is equivalent to the above code
$const1 = "EARTH_IS_FLAT";
$const2 = "APP_ENV_UPPERCASE";
if (constant($const1)) {
print "Earth is flat";
}
print constant($const2);
Output:
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