Which of the following will not return an array containing all normal Latin alphabet characters (A-Z)?

Is the following code valid?

Which will return the complete URL of the requested PHP page?

What is the output?

What is the output?

Which is not true regarding XForms?

How to get the number of arguments passed to a PHP function?

'virtual()' in PHP

Which does not have a resource for a return type?

When passing an object to json_encode(), the default behavior can be modified by:

How would you fall back on the default value of 'Unknown', if a request-parameter is missing or empty?