<Li> A graph . </Li> <Li> A hash, dictionary, map or associative array is a more flexible variation on a record, in which name - value pairs can be added and deleted freely . </Li> <Li> A smart pointer is the abstract counterpart to a pointer . Both are kinds of references . </Li> <P> For convenience, high - level languages may supply ready - made "real world" data types, for instance times, dates and monetary values and memory, even where the language allows them to be built from primitive types . </P>

What are the different data types in php and explain