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.
mysqli::close
mysqli_close
(PHP 5, PHP 7, PHP 8)
mysqli::close -- mysqli_close — Closes a previously opened database connection
Descrizione
Stile orientato agli oggetti
Stile procedurale
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.
Elenco dei parametri
-
link -
Solo nello stile procedurale: un identificatore restituito da mysqli_connect() o mysqli_init()
Valori restituiti
Always returns true.
Log delle modifiche
| Versione | Descrizione |
|---|---|
| 8.0.0 |
This function now always returns true. Previously it returned false on failure.
|
Esempi
Example #1 mysqli::close() example
Stile orientato agli oggetti
<?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 */
}Stile procedurale
<?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 */
}Note
Nota:
mysqli_close() will not close persistent connections. For additional details, see the manual page on persistent connections.
Vedere anche:
- mysqli::__construct() - Open a new connection to the MySQL server
- mysqli_init() - Initializes MySQLi and returns an object for use with mysqli_real_connect()
- mysqli_real_connect() - Opens a connection to a mysql server
- mysqli_free_result() - Frees the memory associated with a result
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php at dafydd dot com ¶
16 years ago
