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mysql_connect
Open a connection to a MySQL Server
(PHP 4, PHP 5, PECL mysql:1.0)
resource mysql_connect ( [string server [, string username [, string password [, bool new_link [, int client_flags]]]]] )
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'. In SQL safe mode, this parameter is ignored and value 'localhost:3306' is always used.
- username
The username. Default value is defined by mysql.default_user. In SQL safe mode, this parameter is ignored and the name of the user that owns the server process is used.
- password
The password. Default value is defined by mysql.default_password. In SQL safe mode, this parameter is ignored and empty password is used.
- new_link
If a second call is made to mysql_connect() with the same arguments, no new link will be established, but instead, the link identifier of the already opened link will be returned. The new_link parameter modifies this behavior and makes mysql_connect() always open a new link, even if mysql_connect() was called before with the same parameters. In SQL safe mode, this parameter is ignored.
- client_flags
The client_flags parameter can be a combination of the following constants: 128 (enable
LOAD DATA LOCALhandling),MYSQL_CLIENT_SSL,MYSQL_CLIENT_COMPRESS,MYSQL_CLIENT_IGNORE_SPACEorMYSQL_CLIENT_INTERACTIVE. Read the section about Table 182, “MySQL client constants” for further information. In SQL safe mode, this parameter is ignored.
ChangeLog
| Version | Description |
|---|---|
| 4.3.0 | Added the client_flags parameter. |
| 4.2.0 | Added the new_link parameter. |
| 3.0.10 | Added support for ":/path/to/socket" with server. |
| 3.0.0 | Added support for ":port" with server. |
Examples
Example 1415. mysql_connect() example
<?php
$link = mysql_connect('localhost', 'mysql_user', 'mysql_password');
if (!$link) {
die('Could not connect: ' . mysql_error());
}
echo 'Connected successfully';
mysql_close($link);
?>
Example 1416. mysql_connect() example using hostname:port syntax
<?php
// we connect to example.com and port 3307
$link = mysql_connect('example.com:3307', 'mysql_user', 'mysql_password');
if (!$link) {
die('Could not connect: ' . mysql_error());
}
echo 'Connected successfully';
mysql_close($link);
// we connect to localhost at port 3307
$link = mysql_connect('127.0.0.1:3307', 'mysql_user', 'mysql_password');
if (!$link) {
die('Could not connect: ' . mysql_error());
}
echo 'Connected successfully';
mysql_close($link);
?>
Example 1417. mysql_connect() example using ":/path/to/socket" syntax
<?php
// we connect to localhost and socket e.g. /tmp/mysql.sock
//variant 1: ommit localhost
$link = mysql_connect('/tmp/mysql', 'mysql_user', 'mysql_password');
if (!$link) {
die('Could not connect: ' . mysql_error());
}
echo 'Connected successfully';
mysql_close($link);
// variant 2: with localhost
$link = mysql_connect('localhost:/tmp/mysql.sock', 'mysql_user', 'mysql_password');
if (!$link) {
die('Could not connect: ' . mysql_error());
}
echo 'Connected successfully';
mysql_close($link);
?>
Notes
Whenever you specify "localhost" or "localhost:port" as server, the MySQL client library will override this and try to connect to a local socket (named pipe on Windows). If you want to use TCP/IP, use "127.0.0.1" instead of "localhost". If the MySQL client library tries to connect to the wrong local socket, you should set the correct path as mysql.default_host string in your PHP configuration and leave the server field blank.
The link to the server will be closed as soon as the execution of the script ends, unless it's closed earlier by explicitly calling mysql_close().
You can suppress the error message on failure by prepending a @ to the function name.
| mysql_pconnect() |
| mysql_close() |