Safely and easily call functions that may not be available (such as those provided by a plugin that gets deactivated)
The functions provided by this plugin provide a more concise syntax for checking for function existence (but it does use
method_exists() under the hood).
_sfce() will both echo and return the echoed value, which may be of use in certain circumstances. And also, since the callback to be safely called is passed as an argument, it can be easily and more concisely parameterized.