The Var_Dump class is a wrapper for the var_dump function.
The var_dump function displays structured information about expressions that includes its type and value. Arrays are explored recursively with values indented to show structure.
The Var_Dump class captures the output of the var_dump function, by using output control functions, and then uses external renderer classes for displaying the result in various graphical ways :
$ cvs -d :pserver:cvsread@cvs.php.net:/repository checkout -P pear/Var_Dump
$ hg clone http://hg.aldabase.com/toolbox/var_dump [directory]