mysqli::__construct

    mysqli::connect

    mysqli_connect

    (PHP 5, PHP 7, PHP 8)

    mysqli::__construct -- mysqli::connect -- mysqli_connect — Open a new connection to the MySQL server

    Açıklama

    Nesne yönelimli kullanım

    publicmysqli::__construct(
        ?string$hostname = null,
        ?string$username = null,
        ?string$password = null,
        ?string$database = null,
        ?int$port = null,
        ?string$socket = null
    )
    publicmysqli::connect(
        ?string$hostname = null,
        ?string$username = null,
        ?string$password = null,
        ?string$database = null,
        ?int$port = null,
        ?string$socket = null
    ): bool

    Yordamsal kullanım

    mysqli_connect(
        ?string$hostname = null,
        ?string$username = null,
        ?string$password = null,
        ?string$database = null,
        ?int$port = null,
        ?string$socket = null
    ): mysqli|false

    Opens a connection to the MySQL Server.

    Bağımsız Değişkenler

    hostname

    Can be either a host name or an IP address. When passing null, the value is retrieved from mysqli.default_host. When possible, pipes will be used instead of the TCP/IP protocol. The TCP/IP protocol is used if a host name and port number are provided together e.g. localhost:3308.

    Prepending host by p: opens a persistent connection. mysqli_change_user() is automatically called on connections opened from the connection pool.

    username

    The MySQL username or null to assume the username based on the mysqli.default_user ini option.

    password

    The MySQL password or null to assume the password based on the mysqli.default_pw ini option.

    database

    The default database to be used when performing queries or null.

    port

    The port number to attempt to connect to the MySQL server or null to assume the port based on the mysqli.default_port ini option.

    socket

    The socket or named pipe that should be used or null to assume the socket based on the mysqli.default_socket ini option.

    Bilginize:

    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 hostname parameter.

    Dönen Değerler

    mysqli_connect() returns an object which represents the connection to a MySQL Server, başarısızlık durumunda false döner.

    mysqli::connect() returns true on success başarısızlık durumunda false döner. Prior to PHP 8.1.0, returns null on success.

    Hatalar/İstisnalar

    Eğer mysqli hata bildirimi etkinse (MYSQLI_REPORT_ERROR) ve istenen işlem başarısız olursa bir uyarı üretilir. Ek olarak, kip MYSQLI_REPORT_STRICT ise bunun yerine mysqli_sql_exception istisnası oluşur.

    Sürüm Bilgisi

    Sürüm: Açıklama
    8.1.0mysqli::connect() now returns true instead of null on success.
    7.4.0 All parameters are now nullable.

    Örnekler

    Örnek 1 mysqli::__construct() example

    Nesne yönelimli kullanım

    <?php


    mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);

    $mysqli = new mysqli('localhost', 'my_user', 'my_password', 'my_db');


    $mysqli->set_charset('utf8mb4');

    printf("Success... %s\n", $mysqli->host_info);

    Yordamsal kullanım

    <?php


    mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);

    $mysqli = mysqli_connect('localhost', 'my_user', 'my_password', 'my_db');


    mysqli_set_charset($mysqli, 'utf8mb4');

    printf("Success... %s\n", mysqli_get_host_info($mysqli));

    The above examples will output something similar to:

    Success... localhost via TCP/IP

    Örnek 2 Extending mysqli class

    <?php

    class FooMysqli extends mysqli {
    public function     __construct($host, $user, $pass, $db, $port, $socket, $charset) {
    mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
    parent::__construct($host, $user, $pass, $db, $port, $socket);
    $this->set_charset($charset);
    }
    }

    $db = new FooMysqli('localhost', 'my_user', 'my_password', 'my_db', 3306, null, 'utf8mb4');

    Örnek 3 Manual error handling

    If error reporting is disabled, the developer is responsible for checking and handling failures

    Nesne yönelimli kullanım

    <?php

    error_reporting    (0);
    mysqli_report(MYSQLI_REPORT_OFF);
    $mysqli = new mysqli('localhost', 'my_user', 'my_password', 'my_db');
    if (    $mysqli->connect_errno) {
    throw new     RuntimeException('mysqli connection error: ' . $mysqli->connect_error);
    }


    $mysqli->set_charset('utf8mb4');
    if (    $mysqli->errno) {
    throw new     RuntimeException('mysqli error: ' . $mysqli->error);
    }

    Yordamsal kullanım

    <?php

    error_reporting    (0);
    mysqli_report(MYSQLI_REPORT_OFF);
    $mysqli = mysqli_connect('localhost', 'my_user', 'my_password', 'my_db');
    if (    mysqli_connect_errno()) {
    throw new     RuntimeException('mysqli connection error: ' . mysqli_connect_error());
    }


    mysqli_set_charset($mysqli, 'utf8mb4');
    if (    mysqli_errno($mysqli)) {
    throw new     RuntimeException('mysqli error: ' . mysqli_error($mysqli));
    }

    Notlar

    Bilginize:

    MySQLnd daima sunucunun öntanımlı bir karakter kümesi olduğunu varsayar. Bu karakter kümesi, mysqlnd'nin kullanacağı uzlaşım/kimlik doğrulama bağlantısı sırasında gönderilir.

    Libmysqlclient, ya my.cnf dosyasındaki öntanımlı karakter kümesini ya da mysqli_init() çağrısından sonraki ilk mysqli_real_connect() çağrısından önce çağrılan mysqli_options() işlevinde belirtilen karakter kümesini kullanır.

    Bilginize:

    Nesne yönelimli kullanım only: If the connection fails, an object is still returned. To check whether the connection failed, use either the mysqli_connect_error() function or the mysqli->connect_error property as in the preceding examples.

    Bilginize:

    If it is necessary to set options, such as the connection timeout, mysqli_real_connect() must be used instead.

    Bilginize:

    Calling the constructor with no parameters is the same as calling mysqli_init().

    Bilginize:

    Error "Can't create TCP/IP socket (10106)" usually means that the variables_order configure directive doesn't contain character E. On Windows, if the environment is not copied the SYSTEMROOT environment variable won't be available and PHP will have problems loading Winsock.

    Ayrıca Bakınız

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