mysqli::real_connect

mysqli_real_connect

Opens a connection to a mysql server

&reftitle.description;

&style.oop;

public `bool` `mysqli::real_connect` ``string``null```hostname`&null; ``string``null```username`&null; ``string``null```password`&null; ``string``null```database`&null; ``int``null```port`&null; ``string``null```socket`&null; `int` `flags` 0

&style.procedural;

`bool` `mysqli_real_connect` `mysqli` `mysql` ``string``null```hostname`&null; ``string``null```username`&null; ``string``null```password`&null; ``string``null```database`&null; ``int``null```port`&null; ``string``null```socket`&null; `int` `flags` 0

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.

&reftitle.parameters;

&mysqli.link.description;

`hostname`

- Can be either a host name or an IP address. When passing &null;, the value is retrieved from mysqli.default_host. When possible, pipes will be used instead of the TCP/IP protocol. The TCP/IP protocol is used if a host name and port number are provided together e.g. `localhost:3308`.

`username`

- The MySQL username or &null; to assume the username based on the mysqli.default_user ini option.

`password`

- The MySQL password or &null; to assume the password based on the mysqli.default_pw ini option.

`database`

- The default database to be used when performing queries or &null;.

`port`

- The port number to attempt to connect to the MySQL server or &null; to assume the port based on the mysqli.default_port ini option.

`socket`

- The socket or named pipe that should be used or &null; to assume the socket based on the mysqli.default_socket ini option.

  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 `hostname` parameter.

`flags`

- With the parameter `flags` you can set different connection options:

  ## 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.

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&reftitle.errors; &mysqli.conditionalexception;
&reftitle.changelog;

&Version; | &Description;
7.4.0 | All parameters are now nullable.

&reftitle.examples;

### `mysqli::real_connect` example

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    <?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();
    ?>

&style.oop; 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();
    ?>

&style.procedural;

    <?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);
    ?>

&examples.outputs;

    Success... MySQL host info: localhost via TCP/IP

&reftitle.notes; &mysqli.charset.note;
&reftitle.seealso;

- `mysqli_connect`
- `mysqli_init`
- `mysqli_options`
- `mysqli_ssl_set`
- `mysqli_close`