Online PHP editor | output for AXNBq

<?php function applyDocumentCasts($keyPattern, Closure $closure) { $casts = [ 'unchanged' => fn ($item) => $item, 'object' => fn ($item) => (object) $item, // 'Serializable' => fn ($item) => new BSONDocument($item), // 'Document' => fn ($item) => Document::fromPHP($item), ]; return array_combine( array_map(fn ($castName) => sprintf($keyPattern, $castName), array_keys($casts)), array_map(fn ($cast) => $closure($cast), $casts), ); } function provideFilterDocuments(): array { $expectedQuery = (object) ['x' => 1]; return applyDocumentCasts( '%s', fn ($cast) => [$cast(['x' => 1]), $expectedQuery] ); } var_dump(provideFilterDocuments());