The following code :

<?php
$test = "";
require_once($test."test.inc");
?>

where test.inc is just:

<?php
echo "HERE";
?>

produces this error when run:
  Parse error: parse error, expecting `T_CONSTANT_ENCAPSED_STRING'
.....    on line 3

If you removing the $test varible or change the function require_once() to require(), include(), or include_once(), the error goes away.

Not sure if this is the intended.  


Using PHP 4.0.2 (not the latest snap shot) on Red Hat 6.2 with Apache.


Tim Pfafman