Use === and !== in null checks instead of == and !=

[samsonasik]

Test :

$foo = '';
echo "\r\nTest with == \r\n";
if ($foo == null) {
    echo 'foo is null';
} else {
    echo 'foo is not null';
}

echo "\r\n-------------------\r\n";

echo "\r\nTest with ===\r\n";
if ($foo === null) {
    echo 'foo is null';
} else {
    echo 'foo is not null';
}

Result :

Test with == 
foo is null
 ------------------- 
Test with === 
foo is not null

[Xerkus]

best name and description 👍