is null php

// The is_null() function checks whether a variable is NULL or not. This function returns true (1) if the variable is NULL, otherwise it returns false/nothing.

<?php
    $var = NULL;  
	if (is_null($var)) {
      	echo "yes, is null";
      
    } else {
      	echo "not null";
    }
?>
  

is null php

is_null($var)

php null

<?php
  
	$var = NULL;  

?>

php check for null

is_null($foo)

null condition in php

is_null (var_name)