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PDO::connect — Connect to a database and return a PDO subclass for drivers that support it
$dsn,$username = null,$password = null,$options = nullCreates an instance of a PDO subclass for the database being connection if it exists, otherwise return a generic PDO instance.
dsnThe Data Source Name, or DSN, contains the information required to connect to the database.
In general, a DSN consists of the PDO driver name, followed by a colon, followed by the PDO driver-specific connection syntax. Further information is available from the PDO driver-specific documentation.
The dsn parameter supports three
different methods of specifying the arguments required to create
a database connection:
dsn contains the full DSN.
dsn consists of uri:
followed by a URI that defines the location of a file containing
the DSN string. The URI can specify a local file or a remote URL.
uri:file:///path/to/dsnfile
dsn consists of a name
name that maps to
pdo.dsn. in php.ini
defining the DSN string.
name
Note:
The alias must be defined in php.ini, and not .htaccess or httpd.conf
usernameThe user name for the DSN string. This parameter is optional for some PDO drivers.
passwordThe password for the DSN string. This parameter is optional for some PDO drivers.
optionsA key=>value array of driver-specific connection options.
Returns an instance of a PDO subclass for the corresponding PDO driver if it exists, or a generic PDO instance.
A PDOException is thrown if the attempt
to connect to the requested database fails,
regardless of which PDO::ATTR_ERRMODE is currently set.