How to check whether a variable is null in PHP ?
Last Updated :
17 Nov, 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
<?php
$var1 = NULL;
$var2 = "\0" ;
$var3 = "NULL" ;
is_null ( $var1 ) ? print_r( "True\n" ) : print_r( "False\n" );
is_null ( $var2 ) ? print_r( "True\n" ) : print_r( "False\n" );
is_null ( $var3 ) ? print_r( "True\n" ) : print_r( "False\n" );
?>
|
Output:
True
False
False
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