use FD\PHPFD as FD; // Define the user entity $user = new FD\Entity('user'); $user->setAttributes([ 'name' => FD\Type::varchar(255), 'email' => FD\Type::varchar(255), 'password' => FD\Type::varchar(255) ]); // Define the post entity $post = new FD\Entity('post'); $post->setAttributes([ 'title' => FD\Type::varchar(255), 'body' => FD\Type::text(), 'published_date' => FD\Type::datetime() ]); // Associate the user entity with the post entity $user->hasMany($post); $post->belongsTo($user); // Generate SQL code for creating tables and constraints $sql = FD\Generator::generateSQL([$user, $post]);Overall, the PHP FD model appears to be a self-contained package that doesn't rely on any external libraries.