mysql_close

(PHP 4, PHP 5)

mysql_close — Close MySQL connection

Avviso

Questa enstensione deprecata da PHP 5.5.0, e sarà rimossa in futuro. Al suo posto, usare l'estensione MySQLi o PDO_MySQL. Vedere anche la guida MySQL: scelta dell'API e le FAQ relative per ulteriori informazioni. Le alternative a questa funzione includono:

mysqli_close()
PDO: Assign the value of null to the PDO object

Descrizione

mysql_close(resource $link_identifier = NULL): bool

mysql_close() closes the non-persistent connection to the MySQL server that's associated with the specified link identifier. If link_identifier isn't specified, the last opened link is used.

Open non-persistent MySQL connections and result sets are automatically destroyed when a PHP script finishes its execution. So, while explicitly closing open connections and freeing result sets is optional, doing so is recommended. This will immediately return resources to PHP and MySQL, which can improve performance. For related information, see freeing resources

Elenco dei parametri

link_identifier: La connessione MySQL. Se l'identificatore di collegamento non è fornito, si utilizza l'ultimo collegamento aperto da mysql_connect(). Se la connessione non viene trovata o se non può essere creata, viene gererato un errore di livello E_WARNING.

Valori restituiti

Restituisce true in caso di successo, false in caso di fallimento.

Esempi

Example #1 mysql_close() example

<?php
$link = mysql_connect('localhost', 'mysql_user', 'mysql_password');
if (!$link) {
    die('Could not connect: ' . mysql_error());
}
echo 'Connected successfully';
mysql_close($link);
?>

Il precedente esempio visualizzerà:

Connected successfully

Note

Nota:
mysql_close() will not close persistent links created by mysql_pconnect(). For additional details, see the manual page on persistent connections.

Vedere anche:

mysql_connect() - Open a connection to a MySQL Server
mysql_free_result() - Free result memory

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User Contributed Notes 2 notes

down

bbodelcampo at yahoo dot co dot uk ¶

18 years ago

A little note about multiple simultaneous connections to different hosts...



I work on a site that pulls content primarily from one db but uses a db on a foreign server to verify licensing.  One might expect the following to work:



<?php

// Open the connection to the primary db

$res1 = mysql_connect($host1, $user1, $pass1);

mysql_select_db($db1);



// Open connection to the license server

$res2 = mysql_connect($host2, $user2, $pass2);

mysql_select_db($db2, $res2);



// Pull license data and close when done

mysql_query($check_sql, $res2);

// ...

mysql_close($res2);



// Now pull content from the primary db

// Not specifying the resource should default to the last open db

mysql_query($query); 

// ...

?>



Turns out this last query, since it cant find an active connection, will try to connect with mysql_connect() with no paramaters.  But if instead you do it as mysql_query($query, $res1), or alternatively, run the mysql_connect for this host again then it works fine.  Thus, it doesnt seem to be possible to have code with an overarching "global" db connection interspersed with temporary connections to another host/db....

down

-5

mdes[SPAM]saintes at gmail dot com ¶

14 years ago

i just came over a problem that i had with apache.

It crashs and said :

"Parent: child process exited with status 3221225477 -- Restarting."

the error came from the extesion php_mysql.dll

i didn't understand what was the reason of that crash..

Then, i debug the script that i had downloaded and i noticed that that was the function mysql_close() which caused the problem.

The solution is, to send to it the link identifier which is optionnal in the description but cause a crash with no commentary.

Thanks to agneady.

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