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PHP mysqli: real_connect() function

mysqli_real_connect() function / mysqli::real_connect

The mysqli_real_connect() function / mysqli::real_connect opens a new connection to the MySQL server.

The mysqli_real_connect() function differs from mysqli_connect() in the following ways:

  • mysqli_real_connect() requires a valid object which has to be created by mysqli_init().
  • It can be used with mysqli_options() to set different options for the connection.
  • It has a flag parameter.

Syntax:

Object oriented style

bool mysqli::real_connect ([ string $host [, string $username [, string $passwd [, string $dbname [, int $port [, string $socket [, int $flags ]]]]]]] )

Procedural style

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

Parameter:

Supported flags
Name Description Required/Optional
link A link identifier returned by mysqli_connect() or mysqli_init() Required for procedural style only and Optional for Object oriented style
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. Required
username The MySQL user name. Required
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). Required
dbname If provided will specify the default database to be used when performing queries. Required
port Specifies the port number to attempt to connect to the MySQL server. Optional
socket Specifies the socket or named pipe that should be used. Optional
flags With the parameter flags you can set different connection options:
Optional
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.

Usage: Procedural style

mysqli_real_connect(connection,host,username,password,dbname,port,socket,flag);

Parameter:

Name Description Required / Optional
connection Specifies the MySQL connection to use Required
host Specifies a host name or an IP address Required
username Specifies the MySQL username Required
password Specifies the MySQL password Required
dbname Specifies the default database to be used Required
port Specifies the port number to attempt to connect to the MySQL server Optional
socket Specifies the socket or named pipe to be used Optional
flag Specifies different connection options. Possible values:
  • MYSQLI_CLIENT_COMPRESS - Use compression protocol
  • MYSQLI_CLIENT_FOUND_ROWS - Return number of matched rows (not affected rows)
  • MYSQLI_CLIENT_IGNORE_SPACE - Allow spaces after function names. Make function names reserved words
  • MYSQLI_CLIENT_INTERACTIVE - Allow interactive_timeout seconds of inactivity before closing connection
  • MYSQLI_CLIENT_SSL - Use SSL encryption
Optional

Return value:

Returns TRUE on success or FALSE on failure.

Version: PHP 5, PHP 7

Example of object oriented style:

<?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', 'user1', 'datasoft123', 'hr')) {
    die('Connect Error (' . mysqli_connect_errno() . ') '
            . mysqli_connect_error());
}

echo 'Success... ' . $mysqli->host_info . "\n";

$mysqli->close();
?>

Output:

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

Example of procedural style:

<?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', 'user1', 'datasoft123', 'hr')) {
    die('Connect Error (' . mysqli_connect_errno() . ') '
            . mysqli_connect_error());
}

echo 'Success... ' . mysqli_get_host_info($link) . "\n";

mysqli_close($link);
?>

Output:

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

See also

PHP Function Reference

Previous: query
Next: real_escape_string



PHP: Tips of the Day

var_export(): var_export() dumps a PHP parseable representation of the item.

You can pass true as the second parameter to return the contents into a variable.

Example:

<?php
$myarray = [ "PHP", "Tips" ];
$mystring = "PHP Tips";
$myint = 28;

var_export($myarray);
var_export($mystring);
var_export($myint);
?>

Output:

array (
  0 => 'PHP',
  1 => 'Tips',
)'PHP Tips'28

To put the content into a variable, you can do this:

$array_export = var_export($myarray, true);
$string_export = var_export($mystring, true);
$int_export = var_export($myint, 1); // any `Truthy` value

After that, you can output it like this:

printf('$myarray = %s; %s', $array_export, PHP_EOL);
printf('$mystring = %s; %s', $string_export, PHP_EOL);
printf('$myint = %s; %s', $int_export, PHP_EOL);

Example:

<?php
$myarray = [ "PHP", "Tips" ];
$mystring = "PHP Tips";
$myint = 28;
$array_export = var_export($myarray, true);
$string_export = var_export($mystring, true);
$int_export = var_export($myint, 1);
printf('$myarray = %s; %s', $array_export, PHP_EOL);
printf('$mystring = %s; %s', $string_export, PHP_EOL);
printf('$myint = %s; %s', $int_export, PHP_EOL);
?>

This will produce the following output:

Output:

$myarray = array (
  0 => 'PHP',
  1 => 'Tips',
);
$mystring = 'PHP Tips';
$myint = 28;