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PHP Functions

Function: mysql_connect

(PHP 3, PHP 4, PHP 5)

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]]]]] )

Opens or reuses a connection to a MySQL server.

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'

username

The username. Default value is the name of the user that owns the server process.

password

The password. Default value is an empty password.

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.

client_flags

The client_flags parameter can be a combination of the following constants: MYSQL_CLIENT_COMPRESS , MYSQL_CLIENT_IGNORE_SPACE or MYSQL_CLIENT_INTERACTIVE .

Return Values

Returns a MySQL link identifier on success, or FALSE on failure.

ChangeLog

Version Description 4.3.0 Added the client_flags parameter. 4.2.0 Added the new_link parameter. 3.0.10 Added support for ":/path/to/socket" with server . 3.0.0 Added support for ":port" with server .

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);
?>

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 mysql.default_host 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.

Related Function(s)

  • mysql_close()
  • mysql_pconnect()
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