Difference between var_dump,var_export & print_r

Question

What is the difference between var_dump, var_export and print_r ?

Answer 1

var_dump and var_export relate like this (from the manual)

var_export() gets structured information about the given variable. It is similar to var_dump() with one exception: the returned representation is valid PHP code.

They differ from print_r that var_dump exports more information, like the datatype and the size of the elements.