$input = [ 'name' => 'John', 'age' => 30, 'email' => 'john@example.com', 'country' => 'US', ]; $hiddenInputs = hiddens_by_key($input, ['email', 'country']); // The $hiddenInputs variable will now contain: // [ // '', // '', // ]In this example, `hiddens_by_key` is being used to generate hidden input fields for the `email` and `country` keys in the `$input` array. The generated HTML will be used as part of a form submission. Based on the function name and signature, `hiddens_by_key` is likely part of a larger package or library related to form generation or submission.