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mysqli::close

mysqli_close

(PHP 5, PHP 7, PHP 8)

mysqli::close -- mysqli_closeCloses a previously opened database connection

Description

Object-oriented style

public mysqli::close(): bool

Procedural style

mysqli_close(mysqli $mysql): bool

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

Returns true on success or 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.

See Also

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User Contributed Notes 1 note

up
-38
php at dafydd dot com
12 years ago
I've had situations where database connections appeared to persist following php execution. So, now, my __destructor function explicitly contains a $cxn->close(). It hurts nothing, and helps avoid memory leaks.
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