How many Data Types Use in PHP

PHP has a total of eight data types which we use to construct our variables:

    Integers: are whole numbers, without a decimal point, like 4195.

    Doubles: are floating-point numbers, like 3.14159 or 49.1.
    Booleans: have only two possible values either true or false.
    NULL: is a special type that only has one value: NULL.
    Strings: are sequences of characters, like 'PHP supports string operations.'
    Arrays: are named and indexed collections of other values.    Objects: are instances of programmer-defined classes, which can package  up both other kinds of values    and functions that are specific to the class.
   Resources: are special variables that hold references to resources external to PHP (such as database connections).

The first five are simple types, and the next two (arrays and objects) are compound - the compound types can package up other arbitrary values of arbitrary type, whereas the simple types cannot.
We will explain only simile data type in this chapters. Array and Objects will be explained separately.