What does “ *RECURSION* ” in print_r output mean?

Question

I\'m using this recursive code to read all directories inside another directory, and store them within the parent directory.

protected function readDirs($parent)         


        

Answer 1

It means that the property is a reference to an object that has already been visited by print_r. print_r detects this and doesn't continue down that path; otherwise, the resulting output would be infinitely long.

In the context of your program, as scandir also returns references to the current and parent directories (named . and .., respectively), following them would lead to recursion. Following symbolic links may also cause recursion.