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Hey guys, welcome back to my channel Ndev tuts.In this tutorial, we will learn about Special Datatypes in PHP and how to use them

effectively in the program. There are two special Datatypes in PHP .first is null

second is resource. let's talk about PHP null. The special null value is used to

represent empty variables in PHP. Null is a special datatype which can have only

one value "null". a variable of datatype null is a variable that has no value

assigned to it. if a variable is created without a value, it is automatically

assigned a value of null. a variable of type null is a variable without any

data. to give a variable the null very simply assign it like this

the special

constant null is capitalized by convention but actually it is

case insensitive you could just as well as have typed.

PHP developers mistakenly consider both

and are same but

this is not true, both variables are different the $var1 has

null while $var2 indicate no value

assigned to it. a variable that has been assigned null has the following property

first it evaluates to false in a boolean context. second its returns false

when tested with Isset() function. let's see the example of PHP null value. here

to create one PHP file null.php

let's writing a code.

variable can also empty by setting the value to null

save the code. let's run the program

this is the output screen. The special resource type is not an actual data type

it is the storing of a reference to functions and resources external to PHP

a common example of using the resource data type is a database call. we will not talk

about the resource type here since it is an advanced topic.