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PHP Quiz PHP CertificatePHP mysql_pconnect() Function
Complete PHP MySQL Reference
Definition and Usage
The mysql_pconnect() function opens a persistent MySQL connection.
This function returns the connection on success, or FALSE and an error on failure. You can hide the error output by adding an '@' in front of the function name.
mysql_pconnect() is much like mysql_connect(), but with two major differences:
- This function will try to find a connection that's already open, with the same host, username and password. If one is found, this will be returned instead of opening a new connection
- The connection will not be closed when the execution of the script ends (mysql_close() will not close connection opened by mysql_pconnect()). It will stay open for future use
Syntax
mysql_pconnect(server,user,pwd,clientflag)
| Parameter | Description |
|---|---|
| server | Optional. Specifies the server to connect to (can also include a port number. e.g. "hostname:port" or a path to a local socket for the localhost). Default value is "localhost:3306" |
| user | Optional. Specifies the username to log in with. Default value is the name of the user that owns the server process |
| pwd | Optional. Specifies the password to log in with. Default is "" |
| clientflag | Optional. Can be a combination of the following constants:
|
Tips and Notes
Tip: To establish a non-persistent MySQL connection, use mysql_connect() instead.
Example
<?php
$con = mysql_pconnect("localhost","mysql_user","mysql_pwd");
if (!$con)
{
die('Could not connect: ' . mysql_error());
}
?>
$con = mysql_pconnect("localhost","mysql_user","mysql_pwd");
if (!$con)
{
die('Could not connect: ' . mysql_error());
}
?>
Complete PHP MySQL Reference
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