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mysql_pconnect
(PHP 4, PHP 5)
mysql_pconnect — Open a persistent connection to a MySQL server
This extension was deprecated in PHP 5.5.0, and it was removed in PHP 7.0.0. Instead, the MySQLi or PDO_MySQL extension should be used. See also MySQL: choosing an API guide and related FAQ for more information. Alternatives to this function include:
- mysqli_connect() with p: host prefix
- PDO::__construct() with
PDO::ATTR_PERSISTENTas a driver option
Description
$server = ini_get("mysql.default_host")
[, string $username = ini_get("mysql.default_user")
[, string $password = ini_get("mysql.default_password")
[, int $client_flags = 0
]]]] ) : resourceEstablishes a persistent connection to a MySQL server.
mysql_pconnect() acts very much like mysql_connect() with two major differences.
First, when connecting, the function would first try to find a (persistent) link that's already open with the same host, username and password. If one is found, an identifier for it will be returned instead of opening a new connection.
Second, the connection to the SQL server will not be closed when the execution of the script ends. Instead, the link will remain open for future use (mysql_close() will not close links established by mysql_pconnect()).
This type of link is therefore called 'persistent'.
Parameters
-
server -
The MySQL server. It can also include a port number. e.g. "hostname:port" or a path to a local socket e.g. ":/path/to/socket" for the localhost.
If the PHP directive mysql.default_host is undefined (default), then the default value is 'localhost:3306'
-
username -
The username. Default value is the name of the user that owns the server process.
-
password -
The password. Default value is an empty password.
-
client_flags -
The
client_flagsparameter can be a combination of the following constants: 128 (enable LOAD DATA LOCAL handling),MYSQL_CLIENT_SSL,MYSQL_CLIENT_COMPRESS,MYSQL_CLIENT_IGNORE_SPACEorMYSQL_CLIENT_INTERACTIVE.
Notes
Note:
Note, that these kind of links only work if you are using a module version of PHP. See the Persistent Database Connections section for more information.
Using persistent connections can require a bit of tuning of your Apache and MySQL configurations to ensure that you do not exceed the number of connections allowed by MySQL.
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Steph