A context is a set of parameters and wrapper specific options which modify or enhance the behavior of a stream. Contexts are created using stream_context_create and can be passed to most filesystem related stream creation functions (i.e. fopen, file, file_get_contents, etc...). Options can be specified when calling stream_context_create, or later using stream_context_set_option. A list of wrapper specific options can be found in the chapter. Parameters can be specified for contexts using the stream_context_set_params function.