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Open a new connection to the MySQL server (PHP 5)
mysqli mysqli_connect ( [string host [, string username [, string passwd [, string dbname [, int port [, string socket]]]]]] )

Procedural style

Object oriented style (constructor):

mysqli {
  __construct(string host,
              string username,
              string passwd,
              string dbname,
              int port,
              string socket);


Opens a connection to the MySQL Server running on.



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 not 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.

Return Values

Returns a object which represents the connection to a MySQL Server or FALSE if the connection failed.


Example 1480. Object oriented style

= new mysqli("localhost", "my_user", "my_password", "world");

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

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

/* close connection */

Example 1481. Procedural style

= mysqli_connect("localhost", "my_user", "my_password", "world");

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

printf("Host information: %s\n", mysqli_get_host_info($link));

/* close connection */

The above example will output:

Host information: Localhost via UNIX socket