这个功能正在检查什么？

Question

I'm trying to port some PHP code over to C#, and I ran across a PHP function of this form:

function DoStuff($myVar, array $myArray1, array $myArray2 = array())
{
    // some code not involving $myArray2

    if ($myArray2)
    {
        // do things with $myArray2, but if I arrive here, what
        // condition was met?
    }
} 

My best guess (which may be completely wrong) after looking over a number of appropriate pages in php.net as to what's happening:

• $myArray2 is optional, but if nothing is provided the array goes in empty
• The if conditional checks to see whether $myArray2 was passed in with one or more elements

Is this correct? If not, what is correct? Thanks!

Answer 1

Yes, this is correct. The function will also throw a fatal error if something that is not an array is passed for $myArray1 or $myArray2.