PHP Manual: Closes a previously opened database connection

Description

Object-oriented style

public true mysqli::close()

Procedural style

true mysqli_close(mysqli $mysql)

Closes a previously opened database connection.

Open non-persistent MySQL connections and result sets are automatically closed when their objects are destroyed. Explicitly closing open connections and freeing result sets is optional. However, it's a good idea to close the connection as soon as the script finishes performing all of its database operations, if it still has a lot of processing to do after getting the results.

Parameters

mysql: Procedural style only: A mysqli object returned by mysqli_connect or mysqli_init

Return Values

Always returns true.

Changelog

Version	Description
8.0.0	This function now always returns `true`. Previously it returned `false` on failure.

Examples

Example #1 mysqli::close example

Object-oriented style

<?php

mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");

$result = $mysqli->query("SELECT Name, CountryCode FROM City ORDER BY ID LIMIT 3");

/* Close the connection as soon as it's no longer needed */
$mysqli->close();

foreach ($result as $row) {
    /* Processing of the data retrieved from the database */
}

Procedural style

<?php

mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = mysqli_connect("localhost", "my_user", "my_password", "world");

$result = mysqli_query($mysqli, "SELECT Name, CountryCode FROM City ORDER BY ID LIMIT 3");

/* Close the connection as soon as it's no longer needed */
mysqli_close($mysqli);

foreach ($result as $row) {
    /* Processing of the data retrieved from the database */
}

Notes

Note:
mysqli_close will not close persistent connections. For additional details, see the manual page on persistent connections.

mysqli::close

mysqli_close