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# mysqli_real_connect

(PHP 5)

mysqli_real_connect

(no version information, might be only in CVS)

mysqli->real_connect() -- Opens a connection to a mysql server

## Beschreibung

Procedural style

bool mysqli_real_connect ( mysqli link [, string host [, string username [, string passwd [, string dbname [, int port [, string socket [, int flags]]]]]]] )

Object oriented style (method)

class 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():

- mysqli_real_connect() needs a valid object which has to be created by function mysqli_init()

- With function mysqli_options() you can set various options for connection.

- There is a `flags` parameter.

## Parameter Liste

`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.

  > Anmerkung: 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:

  Tabelle 1. 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)

  > Anmerkung: 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.

## Rückgabewerte

Gibt bei Erfolg `TRUE` zurück, im Fehlerfall `FALSE`.

## Beispiele

Beispiel 1. Object oriented style

`<?php
/* create a connection object which is not connected */
$mysqli = mysqli_init();
/* set connection options */
$mysqli->options(MYSQLI_INIT_COMMAND, "SET AUTOCOMMIT=0");
$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());
exit();
}
printf ("Connection: %s\n.", $mysqli->host_info);
$mysqli->close();
?>`

Beispiel 2. Procedural style

`<?php
/* 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());
exit();
}
printf ("Connection: %s\n.", mysqli_get_host_info($link));
mysqli_close($link);
?>`

Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

    Connection: Localhost via UNIX socket

## Siehe auch

mysqli_connect()
mysqli_init()
mysqli_options()
mysqli_ssl_set()
mysqli_close()

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