mysql_connect -- Open a connection to a MySQL Server
Description
resource mysql_connect ( [string server [, string username [, string password [, bool new_link [, int client_flags]]]]] )
Opens or reuses a connection to a MySQL server.
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.
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:
MYSQL_CLIENT_SSL,
MYSQL_CLIENT_COMPRESS,
MYSQL_CLIENT_IGNORE_SPACE or
MYSQL_CLIENT_INTERACTIVE.
Read the section about Table 2 for further information.
In SQL safe mode, this parameter is ignored.
Return Values
Returns a MySQL link identifier on success, or FALSE on failure.
Example 2. 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 3. mysql_connect() example using ":/path/to/socket" syntax
<?php // we connect to localhost and socket e.g. /tmp/mysql.sock
// 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
Note:
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_hoststring in your PHP configuration and leave the server field
blank.
Note:
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().
Note:
You can suppress the error message on failure by prepending
a @
to the function name.
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