Does a simple `return` in a PHP function simply end the function prematurely?

Question

I have just seen this

// Check to see if the request is a XHR call    
if (request::is_ajax())
{
  // Send the 403 header
  header(\'HTTP/1.1 403 Forbidden\');
          


        

Answer 1

function text($var) 

{

    if ( ! $var) {
        return;
    }
    do_something();

}

$var = text('');

echo gettype($var);
echo is_bool($var) ? "true" : "false";
echo is_string($var) ? "true" : "false";
echo is_null($var) ? "true" : "false";

returns:

NULL false false true