Description
resource
mysql_connect ( [string server [, string username [, string password [, bool new_link [, int client_flags]]]]])
Returns a MySQL link identifier on success, or FALSE on failure.
mysql_connect() establishes a connection
to a MySQL server. The following defaults are assumed for
missing optional parameters: server =
'localhost:3306', username = name of the
user that owns the server process and
password = empty password.
The server parameter 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.
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_host in your PHP configuration and leave the server field
blank.
Support for ":port" was added in PHP 3.0B4.
Support for ":/path/to/socket" was added in
PHP 3.0.10.
You can suppress the error message on failure by prepending
a @
to the function name.
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. The client_flags
parameter can be a combination of the constants
MYSQL_CLIENT_COMPRESS, MYSQL_CLIENT_IGNORE_SPACE or
MYSQL_CLIENT_INTERACTIVE.
Note:
The new_link parameter became available
in PHP 4.2.0
The client_flags parameter became available in
PHP 4.3.0
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().
Example 1. 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);
?>
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See also
mysql_pconnect() and
mysql_close().
