mysqli::options

mysqli_options

(PHP 5, PHP 7, PHP 8)

mysqli::options -- mysqli_options — Set options

Descrizione

Stile orientato agli oggetti

public mysqli::options(int $option, string|int $value): bool

Stile procedurale

mysqli_options(mysqli $mysql, int $option, string|int $value): bool

Used to set extra connect options and affect behavior for a connection.

This function may be called multiple times to set several options.

mysqli_options() should be called after mysqli_init() and before mysqli_real_connect().

Elenco dei parametri

link

Solo nello stile procedurale: un identificatore restituito da mysqli_connect() o mysqli_init()

option

The option that you want to set. It can be one of the following values:

**Valid options**
Name	Description
`MYSQLI_OPT_CONNECT_TIMEOUT`	Connection timeout in seconds
`MYSQLI_OPT_READ_TIMEOUT`	Command execution result timeout in seconds. Available as of PHP 7.2.0.
`MYSQLI_OPT_LOCAL_INFILE`	Enable/disable use of `LOAD LOCAL INFILE`
`MYSQLI_INIT_COMMAND`	Command to execute after when connecting to MySQL server
`MYSQLI_SET_CHARSET_NAME`	The charset to be set as default.
`MYSQLI_READ_DEFAULT_FILE`	Read options from named option file instead of `my.cnf` Not supported by mysqlnd.
`MYSQLI_READ_DEFAULT_GROUP`	Read options from the named group from `my.cnf` or the file specified with `MYSQL_READ_DEFAULT_FILE`. Not supported by mysqlnd.
`MYSQLI_SERVER_PUBLIC_KEY`	RSA public key file used with the SHA-256 based authentication.
`MYSQLI_OPT_NET_CMD_BUFFER_SIZE`	The size of the internal command/network buffer. Only valid for mysqlnd.
`MYSQLI_OPT_NET_READ_BUFFER_SIZE`	Maximum read chunk size in bytes when reading the body of a MySQL command packet. Only valid for mysqlnd.
`MYSQLI_OPT_INT_AND_FLOAT_NATIVE`	Convert integer and float columns back to PHP numbers when using non-prepared statements. Only valid for mysqlnd.
`MYSQLI_OPT_SSL_VERIFY_SERVER_CERT`	Whether to verify server certificate or not.

value

The value for the option.

Valori restituiti

Restituisce true in caso di successo, false in caso di fallimento.

Errori/Eccezioni

If mysqli error reporting is enabled (MYSQLI_REPORT_ERROR) and the requested operation fails, a warning is generated. If, in addition, the mode is set to MYSQLI_REPORT_STRICT, a mysqli_sql_exception is thrown instead.

Esempi

See mysqli_real_connect().

Note

Nota:
MySQLnd utilizza sempre il set di caratteri di default del sistema. Questo set di caratteri è inviato durante l'handshaking/autenticazione alla connessione.
Libmysqlclient usa il set di caratteri di default impostato nel file my.cnf o attraverso una chiamata esplicita a mysqli_options() prima di chiamare mysqli_real_connect(), ma dopo mysqli_init().

Vedere anche:

mysqli_init() - Initializes MySQLi and returns an object for use with mysqli_real_connect()
mysqli_real_connect() - Opens a connection to a mysql server

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User Contributed Notes 6 notes

down

php at darkain dot com ¶

6 years ago

There is an undocumented option: MYSQLI_OPT_READ_TIMEOUT. This is similar to MYSQLI_OPT_CONNECT_TIMEOUT in theory, but has a slightly different application. Connection timeout only specifies the wait time for the initial TCP connection. Once that is created, the timeout no longer applies. Read timeout, however, is from the time the TCP connection is created until the first packet of actual data is received. There are instances where a TCP connection can be established, but the MySQL server stalls indefinitely, preventing execution from ever returning to PHP. Specifying a read timeout alleviates this condition, whereas connect timeout wouldn't. 

If the MYSQLI_OPT_READ_TIMEOUT constant isn't defined, it is still supported on versions where that isn't the case. You can define it yourself in older PHP versions with the following code.

<?php
if (!defined('MYSQLI_OPT_READ_TIMEOUT')) {
    define ('MYSQLI_OPT_READ_TIMEOUT', 11);
}
?>

You can then use read timeout the same way you could a connect timeout as follows. Please note that since these are two different timeout values for two different parts of the entire connection process, the timeouts do stack (eg: 10 seconds connect timeout + 10 seconds read timeout = maximum possible timeout of 20 seconds)

<?php
//create the object
$connection = mysqli_init();

//specify the connection timeout
$connection->options(MYSQLI_OPT_CONNECT_TIMEOUT, 10);

//specify the read timeout
$connection->options(MYSQLI_OPT_READ_TIMEOUT, 10);

//initiate the connection to the server, using both previously specified timeouts
$connection->real_connect('server', 'user', 'pass', 'database');
?>

down

fluppy ¶

17 years ago

Here es little example to create a SSL Connection



<?php



$db = mysqli_init();



/*

When you want so use a separate cnf

$test = $db->options(MYSQLI_EAD_DEFAULT_FILE,'myother.cnf');

*/



$db->ssl_set('server-key.pem','server-cert.pem',

'cacert.pem',NULL,NULL);



$db->real_connect('localhost','root','','mydb');



//Here some query



$db->close();



?>

down

Procedural Man ¶

2 years ago

Although it is not explained on the manual, MYSQLI_OPT_SSL_VERIFY_SERVER_CERT is an option only valid for mysqlnd and will raise an error if used with mysqli.

down

puneetsharam9 at hotmail dot com ¶

2 years ago

With Objective Approach  
init of mysqli is depreciated from 8.1 it seem so
You could have to use an empty __construct()
So You have proper int and float 

class DB extends \mysqli {
   private function __construct(
           private $_user = DBUSER,
           private $_pass = DBPWD,
           private $_dbName = DBNAME,
           private $_dbHost = DBHOST,
   ) {
      parent::__construct();
      parent::options(MYSQLI_OPT_INT_AND_FLOAT_NATIVE, 1);
      parent::real_connect($this->_dbHost, $this->_user, $this->_pass, $this->_dbName);
      }
   }

down

Guy Sartorelli ¶

1 year ago

The `MYSQLI_OPT_SSL_VERIFY_SERVER_CERT` seems to always fail, with `options()` always returning false.
Use the `MYSQLI_CLIENT_SSL_DONT_VERIFY_SERVER_CERT` flag with `real_connect()` instead.

down

-2

king at bobfish dot org ¶

16 years ago

Example on using mysqli_options to increase size of max_allowed_packet for working with big blobs.

function dbConnect()
{
   $user = 'jomama';
   $pass = 'cartoon';
   $dbName = 'LifeCycle';
   $host = 'localhost';

   $mysqli = mysqli_init();
   mysqli_options($mysqli,MYSQLI_READ_DEFAULT_GROUP,
                                    "max_allowed_packet=50M");
   mysqli_real_connect($mysqli,$host, $user, $pass,$dbName) 
                  or die ('<P>Unable to connect</P>');

   return $mysqli;
}

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