This code will generate multiple checkboxes with the name "color[]" and the values "red", "green", and "blue". The square brackets in the name allow multiple values to be submitted as an array. Package/library: It is unclear what specific package or library this function is from, as it is a relatively simple function that could be written by any PHP developer. It may be included in some third-party form-handling libraries, but it is not a commonly used function that would be associated with a specific package or library.