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. eg. "hostname:port" or a path
to a socket eg. ":/path/to/socket" for the localhost.
注: 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_SSL, MYSQL_CLIENT_COMPRESS,
MYSQL_CLIENT_IGNORE_SPACE or MYSQL_CLIENT_INTERACTIVE.
注: The new_link parameter became available in PHP 4.2.0
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().
See also mysql_pconnect() and
mysql_close().