data type in php

PHP Data Structures

Data Type -

   PHP supports eight types of data structures. Half of these are scalar types, meaning they hold only a single value. These are: Booleans (True/False), integers, floating-point numbers, and strings (any quoted character or sequence of characters).



PHP supports two non-scalar types:

• arrays
• objects




Array

• Arrays are very commonly used, in everything from handling HTML forms to retrieving database query results.

Objects

• Objects are used when performing object-oriented programming.

Finally, PHP supports two special types: resources and NULL-

• Resourses
• NULL




Resourse

• Resource types provide a pointer-like reference to database connections, opened files and directories, dynamically-generated images, etc.

Null

• The NULL type is represented by:
  the constant NULL 
  -a variable not assigned a value
  -a variable that has been unset