Under what condition may HTTP headers be set from PHP if there is content echoed prior to the header function being used?

Answer(s): B

Before the headers are sent, how can you remove a previously set header?

Use the header_remove() function, providing the name of the header
Use the die() function to abort the PHP script
Not possible
Use the headers_list() function, providing the name of the header as the second argument

Answer(s): A

How can you determine whether a PHP script has already sent cookies to the client?

Answer(s): C

An HTML form has two submit buttons. After submitting the form, how can you determine with PHP which button was clicked?

An HTML form may only have one button.
You cannot determine this with PHP only. You must use JavaScript to add a value to the URL
depending on which button has been clicked.
Put the two buttons in different forms, but make sure they have the same name.
Assign name and value attributes to each button and use $_GET or $_POST to find out which button has been clicked.

Answer(s): D

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