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Let's see an example script, along with a directory listing. Keep it short please.

the is_dir is supposed to come back true if reading a directory and false if not.  it doesn't.  it always comes back false.
if used as (not)!is_dir then it works right most of the time but still give the wrong answer for some directories.

Yes, you said that already.

Let's see the script you used which exposes this bug.
For example - this works for me, using 4.3.1 on Windows 2k with apache:
<?php
header('Content-Type: text/plain');
$dir = opendir('.');
while($entry = readdir($dir))
{
        if(is_dir($entry))
                echo "$entry is a dir\n";
        else
                echo "$entry is NOT a dir\n";
}
?>

let's see.  using apache2 on win xp pro

<?

if (!empty($_GET['directory'])) {
	$temp = $_GET['directory'];
	$d = dir("d:/inetpub/wwwroot/$temp");
	$old = $_GET['old'];
} else {
	$d = dir("d:/inetpub/wwwroot");
	$old = "";
}

echo "<h3>Path: ".$d->path."</h3><br>\n";

$dir = $d->path;
$totaldirsize = 0;
$mark = 1;

print "<table width=\"100%\"><tr><td width=\"10%\"><u>File Name:</u></td><td><u>File Size:</u></td></tr>\n";
print "<tr><td colspan=2><hr></td></tr>\n";

while (false !== ($entry = $d->read())) {
	if (!is_dir($entry)) {
		chdir($dir);
		$file = filesize($entry);
		$totaldirsize = $totaldirsize + $file;
		if ($file > 1023) {
			$file = $file / 1024;
			$mark++;
			if ($file > 1023) {
				$file = $file / 1024;
				$mark++;
				if ($file > 1023) {
					$file = $file / 1024;
					$mark++;
				}
			}
		}
		$file = round($file, 3);
		print "<tr><td><a href=\"$dir/$entry\">$entry</a></td>\n";
		if ($mark == 1)
			print "<td>$file Bytes</td></tr>\n";
		elseif ($mark == 2)
			print "<td>$file KBytes</td></tr>\n";
		elseif ($mark == 3)
			print "<td>$file MBytes</td></tr>\n";
		elseif ($mark == 4)
			print "<td>$file GBytes</td></tr>\n";
		else
			print "<td>\"$file\" \"$mark\" UNKNOWN FILE SIZE</td></tr>\n";
		$mark = 1;
	} else {
		if ($entry == ".") {
			print "<tr><td><a href=\"siteadmin.php?directory=\">$entry</a></td><td>directory</td></tr>\n";
		} elseif ($entry == "..") {
			print "<tr><td><a href=\"siteadmin.php?directory=$old\">$entry</a></td><td>directory</td></tr>\n";
		} else {
			$direc = "$dir/$entry";
			for ($i = 19; $i <= (strlen($direc) - 1); $i++) {
				$direct = $direc{$i};
				$dire = "$dire$direct";
			}
			for ($i = 19; $i <= (strlen($dir) - 1); $i++) {
				$temp = $dir{$i};
				$dirtemp = "$dirtemp$temp";
			}
			$old = $dirtemp;
			print "<tr><td><a href=\"siteadmin.php?directory=$dire&old=$old\">$entry</a></td><td>directory</td></tr>\n";
			$dire = "";
		}
	}
}

print "</table><hr><br>\n";

if ($totaldirsize > 1023) {
	$totaldirsize = $totaldirsize / 1024;
	$mark++;
	if ($totaldirsize > 1023) {
		$totaldirsize = $totaldirsize / 1024;
		$mark++;
		if ($totaldirsize > 1023) {
			$totaldirsize = $totaldirsize / 1024;
			$mark++;
		}
	}
}
$totaldirsize = round($totaldirsize, 3);

if ($mark == 1)
print "<td>$totaldirsize Bytes</td></tr>\n";
elseif ($mark == 2)
	print "$totaldirsize KBytes Total\n";
elseif ($mark == 3)
	print "$totaldirsize MBytes Total\n";
elseif ($mark == 4)
	print "$totaldirsize GBytes Total\n";
else
	print "\"$totaldirsize\" \"$mark\" UNKNOWN TOTAL FILE SIZE\n";

$d->close();

?>

Sorry, but your problem does not imply a bug in PHP itself.  For a
list of more appropriate places to ask for help using PHP, please
visit http://www.php.net/support.php as this bug system is not the
appropriate forum for asking support questions. 

Thank you for your interest in PHP.

Next time: make the script shorter, please! We don't need the size stuff.

IIC - when the first entry is a directory it will always fail, because you only change dirs after you read a file.

Make the test:
if(!is_dir("$dir/$entry"))

and you'll see it'll always work.

(currently using php4.2.2)

I too have discovered directories are not always recognised,.  However, I have found they are correctly recognised provided I ensure the path has a '/' on the end.

This bug appears to be widely reported and to my knowledge has not been fixed even in recent versions.  Can someone please investigate?

Thanks.

Please try using this CVS snapshot:

  http://snaps.php.net/php4-STABLE-latest.tar.gz
 
For Windows:
 
  http://snaps.php.net/win32/php4-win32-STABLE-latest.zip

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