Create SQLite database in memory

You have to write

$db = new PDO('sqlite::memory:');

the trailing : is missing.

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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.

Documentation

Not sure @ win permissions, but on *nix, SQLite needs write permision to the dir confining database files for temp files.