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PHP : Function Reference : MySQL Improved Extension : mysqli_real_connect

mysqli_real_connect

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():

Parameters

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.

Note:

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:

Table 191. 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)


Note:

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.

Examples

Example 1539. 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();
?>


Example 1540. 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);
?>


The above example will output:

Connection: Localhost via UNIX socket

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mysqli_affected_rows
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mysqli_bind_param
mysqli_bind_result
mysqli_change_user
mysqli_character_set_name
mysqli_client_encoding
mysqli_close
mysqli_commit
mysqli_connect_errno
mysqli_connect_error
mysqli_connect
mysqli_data_seek
mysqli_debug
mysqli_disable_reads_from_master
mysqli_disable_rpl_parse
mysqli_dump_debug_info
mysqli_embedded_server_end
mysqli_embedded_server_start
mysqli_enable_reads_from_master
mysqli_enable_rpl_parse
mysqli_errno
mysqli_error
mysqli_escape_string
mysqli_execute
mysqli_fetch_array
mysqli_fetch_assoc
mysqli_fetch_field_direct
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mysqli_fetch_row
mysqli_fetch
mysqli_field_count
mysqli_field_seek
mysqli_field_tell
mysqli_free_result
mysqli_get_charset
mysqli_get_client_info
mysqli_get_client_version
mysqli_get_host_info
mysqli_get_metadata
mysqli_get_proto_info
mysqli_get_server_info
mysqli_get_server_version
mysqli_get_warnings
mysqli_info
mysqli_init
mysqli_insert_id
mysqli_kill
mysqli_master_query
mysqli_more_results
mysqli_multi_query
mysqli_next_result
mysqli_num_fields
mysqli_num_rows
mysqli_options
mysqli_param_count
mysqli_ping
mysqli_prepare
mysqli_query
mysqli_real_connect
mysqli_real_escape_string
mysqli_real_query
mysqli_report
mysqli_rollback
mysqli_rpl_parse_enabled
mysqli_rpl_probe
mysqli_rpl_query_type
mysqli_select_db
mysqli_send_long_data
mysqli_send_query
mysqli_server_end
mysqli_server_init
mysqli_set_charset
mysqli_set_local_infile_default
mysqli_set_local_infile_handler
mysqli_set_opt
mysqli_slave_query
mysqli_sqlstate
mysqli_ssl_set
mysqli_stat
mysqli_stmt_affected_rows
mysqli_stmt_attr_get
mysqli_stmt_attr_set
mysqli_stmt_bind_param
mysqli_stmt_bind_result
mysqli_stmt_close
mysqli_stmt_data_seek
mysqli_stmt_errno
mysqli_stmt_error
mysqli_stmt_execute
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mysqli_stmt_field_count
mysqli_stmt_free_result
mysqli_stmt_get_warnings
mysqli_stmt_init
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mysqli_stmt_num_rows
mysqli_stmt_param_count
mysqli_stmt_prepare
mysqli_stmt_reset
mysqli_stmt_result_metadata
mysqli_stmt_send_long_data
mysqli_stmt_sqlstate
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