PHP Editor Review - Pear Manual Package database db intro-connect

Description

To connect to a database you have to use the function connect(), which requires a valid DSN as the first parameter. This parameter can either be a string or an array. If using an array, the array used gets merged with the default information:
$dsn = array( 'phptype' => false, 'dbsyntax' => false, 'username' => false, 'password' => false, 'protocol' => false, 'hostspec' => false, 'port' => false, 'socket' => false, 'database' => false, );
Any elements you set override the defaults and the remainder stay at their defaults.

The second parameter is the optional $options array that can contain runtime configuration settings for this package. See setOption() for more information on the available settings.

In case of success you get a new instance of the database class. It is strongly recommened to check this return value with isError().

To disconnect use the method disconnect() from your database class instance.

Example 33-1. Connect and disconnect

<?php
require_once 'DB.php';

$dsn = 'pgsql://someuser:apasswd@localhost/thedb';
$options = array(
    'debug'       => 2,
    'portability' => DB_PORTABILITY_ALL,
);

$db =& DB::connect($dsn, $options);
if (PEAR::isError($db)) {
    die($db->getMessage());
}

// ...

$db->disconnect();
?>

Example 33-2. Connect using an array for the DSN information

<?php
require_once 'DB.php';

$dsn = array(
    'phptype'  => 'pgsql',
    'username' => 'someuser',
    'password' => 'apasswd',
    'hostspec' => 'localhost',
    'database' => 'thedb',
);

$options = array(
    'debug'       => 2,
    'portability' => DB_PORTABILITY_ALL,
);

$db =& DB::connect($dsn, $options);
if (PEAR::isError($db)) {
    die($db->getMessage());
}
?>

When connecting to SQLite using a DSN array, the value of the mode element must be a string:
<?php $dsn = array( 'phptype' => 'sqlite', 'database' => 'thedb', 'mode' => '0644', ); ?>

Example 33-3. Connect to MySQLi via SSL using an array for the DSN information

The ssl element of the $options array must be set to TRUE in order for SSL to work. Each of the extra elements in the $dsn array (key through cipher in the example below) are optional.

<?php
require_once 'DB.php';

$dsn = array(
    'phptype'  => 'mysqli',
    'username' => 'someuser',
    'password' => 'apasswd',
    'hostspec' => 'localhost',
    'database' => 'thedb',
    'key'      => 'client-key.pem',
    'cert'     => 'client-cert.pem',
    'ca'       => 'cacert.pem',
    'capath'   => '/path/to/ca/dir',
    'cipher'   => 'AES',
);

$options = array(
    'ssl' => true,
);

$db =& DB::connect($dsn, $options);
if (PEAR::isError($db)) {
    die($db->getMessage());
}
?>

Example 33-4. Connect to a PostgreSQL database via a socket

<?php
require_once 'DB.php';

$dsn = 'pgsql://someuser:apasswd@unix(/tmp)/thedb';
$options = array(
    'debug'       => 2,
    'portability' => DB_PORTABILITY_ALL,
);

$db =& DB::connect($dsn, $options);
if (PEAR::isError($db)) {
    die($db->getMessage());
}
?>

Introduction - Connect

Description

See