PHP is_null() Function

The is_null() function in PHP is used to  find whether the specified variable is a null or not. It returns a Boolean value true if the parameter var is null else it returns false.

Syntax

is_null ( mixed $var )

var(required)- This parameter represents the value to check.

Return

This function returns a Boolean value TRUE if the parameter var is null, else it returns FALSE.

Example 1

Output

The var is null

Example 2

#case-sensitive

Output

The var is null

Example 3

Output

The var is not null