I can't get function arguments initalized to 'unset' to work anymore.
This example works fine:

  function myfunc( $arg=1 )
  {
    echo $arg."<br>\n";
  }

  myfunc( );
  myfunc( 'Hello, world.' );

Printing out '1' and 'Hello, world.' as expected.  Modify it to:

  function myfunc( $arg=unset )
  {
    echo $arg."<br>\n";
  }

  myfunc( );
  myfunc( 'Hello, world.' );

This version gives me:

  Parse error: parse error in /www/htdocs/test.html on line 7

where line 7 is the function myfunc() line.

This all worked fine with PHP4 betas 2 & 3.