How do I find out the number of parameters passed into function?

PHP provides a function name func_num_args() which returns the number of parameters passed in.

for example:

<?phpfunction foo()
{
    $numargs = func_num_args();
    echo "Number of arguments: $numargs\n";
}
foo(1, 2, 3);    // Prints 'Number of arguments: 3'?>

Cheers!