mysql_connect
(PHP 4, PHP 5, PECL mysql:1.0) 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
]]]]] )
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 LOCAL handling),
MYSQL_CLIENT_SSL,
MYSQL_CLIENT_COMPRESS,
MYSQL_CLIENT_IGNORE_SPACE or
MYSQL_CLIENT_INTERACTIVE.
Read the section about Predefined Constants for further information.
In SQL safe mode, this parameter is ignored.
Return Values
Returns a MySQL link identifier on success, or FALSE on failure.
Examples
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);
?>
Example #2 mysql_connect() example using hostname:port syntax
<?php
$link = mysql_connect('example.com:3307', 'mysql_user', 'mysql_password');
if (!$link) {
die('Could not connect: ' . mysql_error());
}
echo 'Connected successfully';
mysql_close($link);
$link = mysql_connect('127.0.0.1:3307', 'mysql_user', 'mysql_password');
if (!$link) {
die('Could not connect: ' . mysql_error());
}
echo 'Connected successfully';
mysql_close($link);
?>
Example #3 mysql_connect() example using ":/path/to/socket" syntax
<?php
$link = mysql_connect(':/tmp/mysql', 'mysql_user', 'mysql_password');
if (!$link) {
die('Could not connect: ' . mysql_error());
}
echo 'Connected successfully';
mysql_close($link);
$link = mysql_connect('localhost:/tmp/mysql.sock', 'mysql_user', 'mysql_password');
if (!$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
Runtime Configuration 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.
Note:
Error "Can't create TCP/IP socket (10106)" usually means that the variables_order configure directive
doesn't contain character E. On Windows, if the
environment is not copied the SYSTEMROOT environment
variable won't be available and PHP will have problems loading Winsock.
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User Contributed Notes
Open a connection to a MySQL Server
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mysql_close
