Description:
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Manual page: http://www.php.net/pdo.construct
has no information about how to specify DSN parameters with special characters.

For example PostgreSQL supports database names containing slash (/) or even semicolon (;).
How should I encode DSN dbname parameter to connect to a database named "qwer;asdf"?

I tried:

$dsn = 'pgsql:host=127.0.0.1;dbname=asdf;asdf';
$dsn = 'pgsql:host=127.0.0.1;dbname=asdf\;asdf';
$dsn = 'pgsql:host=127.0.0.1;dbname=asdf%3basdf';
$dsn = 'pgsql:host=127.0.0.1;dbname=asdf%3Basdf';

but none of those works.

If I create database named "asdf/asdf", DSN:

$dsn = 'pgsql:host=127.0.0.1;dbname=asdf/asdf';

work, but according to https://pear.php.net/manual/en/package.database.db.intro-dsn.php
you should basicly url-encode parameters.

But both:

$dsn = 'pgsql:host=127.0.0.1;dbname=asdf%2fasdf';
$dsn = 'pgsql:host=127.0.0.1;dbname=asdf%2Fasdf';

do not work.

Expected result:
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PDO constructor should support DSN string that contain database name with semicolon in it.