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How to check whether a variable is null in PHP ?
  • Last Updated : 24 Jan, 2021

We have given a variable and the task is to check whether the value of given variable is null or not and returns a Boolean value using PHP. To check a variable is null or not, we use is_null() function. A variable is considered to be NULL if it does not store any value. It returns TRUE if value of variable $var is NULL, otherwise, returns FALSE.

Syntax

boolean is_null( $var )

Example:

PHP

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<?php 
// PHP Progran to check whether 
// a variable is null or not?
  
$var1 = NULL; 
$var2 = "\0"; // "\0" means null character 
$var3 = "NULL"
  
// $var1 has NULL value, so always give TRUE 
is_null($var1) ? print_r("True\n") : print_r("False\n"); 
  
// $var2 has '\0' value which consider as null in 
// c and c++ but here taken as string, gives FALSE 
is_null($var2) ? print_r("True\n") : print_r("False\n"); 
  
// $var3 has NULL string value so it will false 
is_null($var3) ? print_r("True\n") : print_r("False\n"); 
  
?>

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Output:

True
False
False
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