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:
* Simple text,
* HTML/XHTML text,
* HTML/XHTML table,
* XML,
* ...

WWW: https://pear.php.net/package/Var_Dump