Which one of the following PHP functions can be used to build a function that accepts any number of arguments?

<?php
function foo()
{
      $args = func_get_args();
      foreach ($args<spanclass="p-green">as</span>$k => $v)
      { 
           echo "arg".($k<spanclass="p-blue">+</span><spanclass="p-red">1</span><spanclass="p-blue">).</span><spanclass="p-red">":$vn";  
      }
}
foo();
/* will print nothing */
 
foo("Hello");
/* will print Hello */
 
foo("Hello","World","Bye");
/* will print Hello World Bye */
?>