[PHP] unexpected include parse error

[Paul Furman]

I'm new so probably missing something easy or doing something terribly 
wrong but I have spent a lot of time experimenting...

<?php
  $dirstr= "./"
  include 'scandir.php';
  scandir('$dirstr');
?>
parse error, unexpected T_INCLUDE in [the above file]

if I comment out the
  $dirstr= "./"
above that error goes away and the scandir.php include runs (that's a 
php5 function that needs to be defined manually in PHP 4.3.4)

#scandir.php
<?php
#$dirstr=".\";
  function scandir($dirstr) {
     $files = array();
     $fh = opendir($dirstr);
     while (false !== ($filename = readdir($fh))) {
         array_push($files, $filename);
     }
     closedir($fh);
     return $files;
  }
?>


If I set $dirstr=".\"; in the function it gives these errors:

Parse error: unexpected $end in scandir.php at    ?> last line
Fatal error: Call to undefined function: scandir() in showdir.php


If I don't set $dirstr at all, it runs the scandir function and fouls up 
in expected ways:

Warning: opendir($dirstr): failed to open dir: Invalid argument in 
scandir.php

Warning: readdir(): supplied argument is not a valid Directory resource 
in scandir.php

Warning: closedir(): supplied argument is not a valid Directory resource 
in scandir.php

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