Special Types

There are 2 special data types in PHP

1. Resource
2. Null

Resource Data type:

It refers the external resources like database connection, FTP connection, file pointers, etc. In simple terms, a resource is a special variable which carrying a reference to an external resource.

Example 1

Example 2

Example 3

Null Data Type:

A variable of type Null is a variable without any data. In PHP, null is not a value, and we can consider it as a null variable based on 3 condition.

1. If the variable is not set with any value.
2. If the variable is set with a null value.
3. If the value of the variable is unset.

Example 1

Example 2

Example 3