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Opens a connection to a mysql server (PHP 5)
bool mysqli_real_connect ( mysqli link [, string host [, string username [, string passwd [, string dbname [, int port [, string socket [, int flags]]]]]]] )

Procedural style

Object oriented style (method)

mysqli {
  bool real_connect(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():



Procedural style only: A link identifier returned by mysqli_connect() or mysqli_init()


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.


The MySQL user name.


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).


If provided will specify the default database to be used when performing queries.


Specifies the port number to attempt to connect to the MySQL server.


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.


With the parameter flags you can set different connection options:

Table 191. Supported flags

MYSQLI_CLIENT_COMPRESSUse compression protocol
MYSQLI_CLIENT_FOUND_ROWSreturn number of matched rows, not the number of affected rows
MYSQLI_CLIENT_IGNORE_SPACEAllow 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


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.

Return Values

Returns TRUE on success or FALSE on failure.


Example 1539. Object oriented style


/* create a connection object which is not connected */
$mysqli = mysqli_init();

/* set connection options */
$mysqli->options(MYSQLI_OPT_CONNECT_TIMEOUT, 5);

/* connect to server */
$mysqli->real_connect('localhost', 'my_user', 'my_password', 'world');

/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());

printf ("Connection: %s\n.", $mysqli->host_info);


Example 1540. Procedural style


/* create a connection object which is not connected */
$link = mysqli_init();

/* set connection options */
mysqli_options($link, MYSQLI_INIT_COMMAND, "SET AUTOCOMMIT=0");
mysqli_options($link, MYSQLI_OPT_CONNECT_TIMEOUT, 5);

/* connect to server */
mysqli_real_connect($link, 'localhost', 'my_user', 'my_password', 'world');

/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());

printf ("Connection: %s\n.", mysqli_get_host_info($link));


The above example will output:

Connection: Localhost via UNIX socket