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');
?>
mysqli::options
mysqli_options
(PHP 5, PHP 7, PHP 8)
mysqli::options -- mysqli_options — Set options
Description
Object-oriented style
Procedural style
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().
Parameters
-
mysql -
Procedural style only: A mysqli object returned by mysqli_connect() or 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_TIMEOUTConnection timeout in seconds MYSQLI_OPT_READ_TIMEOUTCommand execution result timeout in seconds. Available as of PHP 7.2.0. MYSQLI_OPT_LOCAL_INFILEEnable/disable use of LOAD LOCAL INFILEMYSQLI_INIT_COMMANDCommand to execute after when connecting to MySQL server MYSQLI_SET_CHARSET_NAMEThe charset to be set as default. MYSQLI_READ_DEFAULT_FILERead options from named option file instead of my.cnf Not supported by mysqlnd. MYSQLI_READ_DEFAULT_GROUPRead options from the named group from my.cnf or the file specified with MYSQL_READ_DEFAULT_FILE. Not supported by mysqlnd.MYSQLI_SERVER_PUBLIC_KEYRSA public key file used with the SHA-256 based authentication. MYSQLI_OPT_NET_CMD_BUFFER_SIZEThe size of the internal command/network buffer. Only valid for mysqlnd. MYSQLI_OPT_NET_READ_BUFFER_SIZEMaximum read chunk size in bytes when reading the body of a MySQL command packet. Only valid for mysqlnd. MYSQLI_OPT_INT_AND_FLOAT_NATIVEConvert integer and float columns back to PHP numbers when using non-prepared statements. Only valid for mysqlnd. MYSQLI_OPT_SSL_VERIFY_SERVER_CERTWhether to verify server certificate or not. -
value -
The value for the option.
Return Values
Returns true on success or false on failure.
Errors/Exceptions
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.
Examples
Notes
Note:
MySQLnd always assumes the server default charset. This charset is sent during connection hand-shake/authentication, which mysqlnd will use.
Libmysqlclient uses the default charset set in the my.cnf or by an explicit call to mysqli_options() prior to calling mysqli_real_connect(), but after mysqli_init().
See Also
- mysqli_init() - Initializes MySQLi and returns an object for use with mysqli_real_connect()
- mysqli_real_connect() - Opens a connection to a mysql server
add a note
User Contributed Notes 6 notes
php at darkain dot com ¶
6 years ago
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();
?>
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.
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.
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);
}
}
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;
}
