Create SQLite database in memory
You have to write
$db = new PDO('sqlite::memory:');the trailing : is missing.
The PDO_SQLITE Data Source Name (DSN) is composed of the following elements:
The DSN prefix is sqlite:.
To access a database on disk, append the absolute path to the DSN prefix.
To create a database in memory, append :memory: to the DSN prefix.
Not sure @ win permissions, but on *nix, SQLite needs write permision to the dir confining database files for temp files.