mysql_connect

    (PHP 4, PHP 5)

    mysql_connect — Open a connection to a MySQL Server

    Aviso

    Esta extensão tornou-se defasada a partir do PHP 5.5.0 e foi removida no PHP 7.0.0. Em vez disso, as extensões MySQLi ou PDO_MySQL devem ser usadas. Veja também o guia MySQL: escolhendo uma API. Alternativas a esta função incluem:

    Descrição

    mysql_connect(
        string$server = ini_get("mysql.default_host"),
        string$username = ini_get("mysql.default_user"),
        string$password = ini_get("mysql.default_password"),
        bool$new_link = false,
        int$client_flags = 0
    ): resource|false

    Opens or reuses a connection to a MySQL server.

    Parâmetros

    server

    The MySQL server. It can also include a port number. e.g. "hostname:port" or a path to a local socket e.g. ":/path/to/socket" for the localhost.

    If the PHP directive mysql.default_host is undefined (default), then the default value is 'localhost:3306'. In modo seguro do SQL, this parameter is ignored and value 'localhost:3306' is always used.

    username

    The username. Default value is defined by mysql.default_user. In modo seguro do SQL, this parameter is ignored and the name of the user that owns the server process is used.

    password

    The password. Default value is defined by mysql.default_password. In modo seguro do SQL, this parameter is ignored and empty password is used.

    new_link

    If a second call is made to mysql_connect() with the same arguments, no new link will be established, but instead, the link identifier of the already opened link will be returned. The new_link parameter modifies this behavior and makes mysql_connect() always open a new link, even if mysql_connect() was called before with the same parameters. In modo seguro do SQL, this parameter is ignored.

    client_flags

    The client_flags parameter can be a combination of the following constants: 128 (enable LOAD DATA LOCAL handling), MYSQL_CLIENT_SSL, MYSQL_CLIENT_COMPRESS, MYSQL_CLIENT_IGNORE_SPACE or MYSQL_CLIENT_INTERACTIVE. Read the section about MySQL client constants for further information. In modo seguro do SQL, this parameter is ignored.

    Valor Retornado

    Returns a MySQL link identifier on success ou false em caso de falha.

    Exemplos

    Exemplo #1 mysql_connect() example

    <?php
    $link     = mysql_connect('localhost', 'mysql_user', 'mysql_password');
    if (!    $link) {
    die(    'Could not connect: ' . mysql_error());
    }
    echo     'Connected successfully';
    mysql_close($link);
    ?>

    Exemplo #2 mysql_connect() example using hostname:port syntax

    <?php
    // we connect to example.com and port 3307
    $link = mysql_connect('example.com:3307', 'mysql_user', 'mysql_password');
    if (!    $link) {
    die(    'Could not connect: ' . mysql_error());
    }
    echo     'Connected successfully';
    mysql_close($link);

    // we connect to localhost at port 3307
    $link = mysql_connect('127.0.0.1:3307', 'mysql_user', 'mysql_password');
    if (!    $link) {
    die(    'Could not connect: ' . mysql_error());
    }
    echo     'Connected successfully';
    mysql_close($link);
    ?>

    Exemplo #3 mysql_connect() example using ":/path/to/socket" syntax

    <?php
    // we connect to localhost and socket e.g. /tmp/mysql.sock

    // variant 1: omit localhost
    $link = mysql_connect(':/tmp/mysql', 'mysql_user', 'mysql_password');
    if (!    $link) {
    die(    'Could not connect: ' . mysql_error());
    }
    echo     'Connected successfully';
    mysql_close($link);


    // variant 2: with localhost
    $link = mysql_connect('localhost:/tmp/mysql.sock', 'mysql_user', 'mysql_password');
    if (!    $link) {
    die(    'Could not connect: ' . mysql_error());
    }
    echo     'Connected successfully';
    mysql_close($link);
    ?>

    Notas

    Nota:

    Whenever you specify "localhost" or "localhost:port" as server, the MySQL client library will override this and try to connect to a local socket (named pipe on Windows). If you want to use TCP/IP, use "127.0.0.1" instead of "localhost". If the MySQL client library tries to connect to the wrong local socket, the correct path should be set as mysql.default_host in php.ini and the server field left blank.

    Nota:

    The link to the server will be closed as soon as the execution of the script ends, unless it's closed earlier by explicitly calling mysql_close().

    Nota:

    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.

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