是否可以通过Post / Get传递Null值？ （PHP）

Question

Is it possible to pass Null value via Post / Get?

By null, I mean something that will return true on isset() but false on empty().

Reason is, I want to know if I need an extra check on $_GET where I'm checking the following:

if (isset() && !empty()) {
    // do stuff
} elseif (isset() && empty()) {  // In other words, omit this one.
    // do other stuff
} else {
    //foo bar
}

Thanks,

Answer 1

If a GET variable is not present (i.e. script.php), you will get:

• isset($_GET['var']) = false
• empty($_GET['var']) = true

If it is present but has no value (i.e. script.php?test=), you will get:

• isset($_GET['var']) = true
• empty($_GET['var']) = true

Thus testing that isset($_GET['var']) && !empty($_GET['var']) is enough to guarantee that your GET variable exists and has a proper value.