使用鞋垫功能检查任一列是否为空

Question

I would like to check if either of the column has null in it using the isnull function but it doesn't seem to work... When I set either of the fields to none it still returns false

$result = mysql_query("select Apps.Email from Apps");
$row = mysql_fetch_array($result);

My if statement:

if(is_null($row["Person1"], $row["Person2"])){
// stuff here
}

It works fine when I change it to:

if (is_null($row["Person1"])

Answer 1

Use or logic.

if(is_null($row["Person1"]) || is_null($row["Person2"])){
// stuff here
}

Or whatever the or symbol is in php.