PHP is_null() function

This function is used to check whether a variable is null or not.

Syntax

is_null(variable_name);

variable_name is the required parameter.

Example

<?php
    $var1;
    $var2 = 'Hello World';
    if(is_null($var1)) {
        echo 'Null Variable';
    }
    if(is_null($var2)){
        echo 'Null Variable';
    }
?>

Output -

Null Variable

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