title: Define default values for function arguments
body: <p>In the Lua wiki I found a way to define default values for missing arguments:</p>
  
  <pre><code>function myfunction(a,b,c)
      b = b or 7
      c = c or 5
      print (a,b,c)
  end
  </code></pre>
  
  <p>Is that the only way? The PHP style <code>myfunction (a,b=7,c=5)</code> does not seem to work. Not that the Lua way doesn't work, I am just wondering if this is the only way to do it.</p>