Question

What PHP versions supports this:

function mytest($mVar = null) {    
    ($mVar === null) and ($mVar = "Hello"); // <--- This line
    echo $mVar;
}

Does it work in PHP versions lower than 5.3.x ?

Answer 1

It works on all versions you might encounter, there’s nothing special to it. All of the operators (===, and, =) have been there since the dawn of time (official scientific term).

Of course you don’t have to take my word for it; you can always see for yourself.

Edit: Of course, I really don’t see the point in the code above. You could have written the equivalent and simpler

function mytest($mVar = null) {    
    if ($mVar === null) {
        $mVar = "Hello";
    }
    echo $mVar;
}

or even

function mytest($mVar = "Hello") {    
    echo $mVar;
}