PHP is null

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PHP : is_null() function

Description

The is_null () function is used to test whether a variable is NULL or not.

Version

(PHP 4 and above)

Syntax

is_null (var_name)

Parameter

Name

Description

Required /
Optional

Type

var_name

The variable being checked

Required

Mixed*

*Mixed : Mixed indicates that a parameter may accept multiple (but not necessarily all) types.

Return value

Returns TRUE if var_name is null, FALSE otherwise.

Value Type : Boolean.

Example :

  1. $var_name = TRUE;  

  2. if (is_null($var_name))  

  3. {  

  4. echo 'Variable is  NULL';  

  5. }  

  6. else  

  7. {  

  8. echo 'Variable is not NULL';  

  9. }  

  10. ?>  

Output :

Variable is not NULL