MySQL and PHP
Copyright 1997-2021 the PHP Documentation Group.
mysqli::real_connect
mysqli_real_connect
Opens a connection to a mysql server
Object oriented style
public bool mysqli::real_connect(string host,
string username,
string passwd,
string dbname,
int port,
string socket,
int flags);
Procedural style
bool mysqli_real_connect(mysqli link,
string host,
string username,
string passwd,
string dbname,
int port,
string socket,
int flags);
Establish a connection to a MySQL database engine.
This function differs from
mysqli_connect
:
mysqli_real_connect
needs a valid object which has to be created by function
mysqli_init
.
With the
mysqli_options
function you can set various options for connection.
There is a flags
parameter.
link
Procedural style only: A link identifier returned by
mysqli_connect
or
mysqli_init
host
Can be either a host name or an IP address. Passing the
null
value or the string
"localhost" to this parameter, the local host
is assumed. When possible, pipes will be used instead of
the TCP/IP protocol.
username
The MySQL user name.
passwd
If provided or null
, the MySQL
server will attempt to authenticate the user against
those user records which have no password only. This
allows one username to be used with different
permissions (depending on if a password as provided or
not).
dbname
If provided will specify the default database to be used when performing queries.
port
Specifies the port number to attempt to connect to the MySQL server.
socket
Specifies the socket or named pipe that should be used.
Specifying the socket
parameter
will not explicitly determine the type of connection
to be used when connecting to the MySQL server. How
the connection is made to the MySQL database is
determined by the host
parameter.
flags
With the parameter flags
you can
set different connection options:
Table 3.11 Supported flags
Name | Description |
---|---|
MYSQLI_CLIENT_COMPRESS | Use compression protocol |
MYSQLI_CLIENT_FOUND_ROWS | return number of matched rows, not the number of affected rows |
MYSQLI_CLIENT_IGNORE_SPACE | Allow spaces after function names. Makes all function names reserved words. |
MYSQLI_CLIENT_INTERACTIVE | Allow interactive_timeout seconds (instead of
wait_timeout seconds) of
inactivity before closing the connection |
MYSQLI_CLIENT_SSL | Use SSL (encryption) |
MYSQLI_CLIENT_SSL_DONT_VERIFY_SERVER_CERT | Like MYSQLI_CLIENT_SSL , but disables validation of
the provided SSL certificate. This is only for
installations using MySQL Native Driver and
MySQL 5.6 or later. |
For security reasons the
MULTI_STATEMENT
flag is not
supported in PHP. If you want to execute multiple
queries use the
mysqli_multi_query
function.
Returns true
on success or
false
on failure.
Example 3.61 mysqli::real_connect
example
Object oriented style
<?php $mysqli = mysqli_init(); if (!$mysqli) { die('mysqli_init failed'); } if (!$mysqli->options(MYSQLI_INIT_COMMAND, 'SET AUTOCOMMIT = 0')) { die('Setting MYSQLI_INIT_COMMAND failed'); } if (!$mysqli->options(MYSQLI_OPT_CONNECT_TIMEOUT, 5)) { die('Setting MYSQLI_OPT_CONNECT_TIMEOUT failed'); } if (!$mysqli->real_connect('localhost', 'my_user', 'my_password', 'my_db')) { die('Connect Error (' . mysqli_connect_errno() . ') ' . mysqli_connect_error()); } echo 'Success... ' . $mysqli->host_info . "\n"; $mysqli->close(); ?>
Object oriented style when extending mysqli class
<?php class foo_mysqli extends mysqli { public function __construct($host, $user, $pass, $db) { parent::init(); if (!parent::options(MYSQLI_INIT_COMMAND, 'SET AUTOCOMMIT = 0')) { die('Setting MYSQLI_INIT_COMMAND failed'); } if (!parent::options(MYSQLI_OPT_CONNECT_TIMEOUT, 5)) { die('Setting MYSQLI_OPT_CONNECT_TIMEOUT failed'); } if (!parent::real_connect($host, $user, $pass, $db)) { die('Connect Error (' . mysqli_connect_errno() . ') ' . mysqli_connect_error()); } } } $db = new foo_mysqli('localhost', 'my_user', 'my_password', 'my_db'); echo 'Success... ' . $db->host_info . "\n"; $db->close(); ?>
Procedural style
<?php $link = mysqli_init(); if (!$link) { die('mysqli_init failed'); } if (!mysqli_options($link, MYSQLI_INIT_COMMAND, 'SET AUTOCOMMIT = 0')) { die('Setting MYSQLI_INIT_COMMAND failed'); } if (!mysqli_options($link, MYSQLI_OPT_CONNECT_TIMEOUT, 5)) { die('Setting MYSQLI_OPT_CONNECT_TIMEOUT failed'); } if (!mysqli_real_connect($link, 'localhost', 'my_user', 'my_password', 'my_db')) { die('Connect Error (' . mysqli_connect_errno() . ') ' . mysqli_connect_error()); } echo 'Success... ' . mysqli_get_host_info($link) . "\n"; mysqli_close($link); ?>
The above examples will output:
Success... MySQL host info: localhost via TCP/IP
MySQLnd always assumes the server default charset. This charset is sent during connection hand-shake/authentication, which mysqlnd will use.
Libmysqlclient uses the default charset set in the
my.cnf
or by an explicit call to
mysqli_options
prior to calling
mysqli_real_connect
,
but after
mysqli_init
.
mysqli_connect
|
mysqli_init
|
mysqli_options
|
mysqli_ssl_set
|
mysqli_close
|