PHP mysqli: kill() function
mysqli_kill() function / mysqli::kill
The mysqli_kill() function / mysqli::kill asks the server to kill a MySQL thread specified by the processid parameter.
Syntax:
Object oriented style
bool mysqli::kill ( int $processid )
Procedural style
bool mysqli_kill ( mysqli $link , int $processid )
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_kill(connection,processid);
Parameter:
Name | Description | Required / Optional |
---|---|---|
connection | Specifies the MySQL connection to use | Required |
processid | The thread ID returned from mysqli_thread_id() | Required |
Return value:
Returns TRUE on success or FALSE on failure.
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 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: insert_id
Next: more_results
PHP: Tips of the Day
PHP: Correct file permissions for WordPress
When you setup WP you (the webserver) may need write access to the files. So the access rights may need to be loose.
chown www-data:www-data -R * # Let Apache be owner find . -type d -exec chmod 755 {} \; # Change directory permissions rwxr-xr-x find . -type f -exec chmod 644 {} \; # Change file permissions rw-r--r-
After the setup you should tighten the access rights, according to Hardening WordPress all files except for wp-content should be writable by your user account only. wp-content must be writable by www-data too.
chown <username>:<username> -R * # Let your useraccount be owner chown www-data:www-data wp-content # Let apache be owner of wp-content
Maybe you want to change the contents in wp-content later on. In this case you could
- temporarily change to the user to www-data with su,
- give wp-content group write access 775 and join the group www-data or
- give your user the access rights to the folder using ACLs.
Whatever you do, make sure the files have rw permissions for www-data.
Ref : https://bit.ly/3hcrTkL
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