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PHP - Is_dir()

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Is_dir()	View Content

I have the following code...

	While(($file = readdir($handle)) !== FALSE){
	   if(is_dir($file))){
	      echo "$file - Directory<br>";
	   }else{
	      echo "$file - Not Directory<br>";
       }
    }

And I have the following files/folders...

	2019-holiday-party
	     _photos
	     _thumbnails
	     xxx
	     IMG_2205.png

I get these results...

	. - Directory
	.. - Directory
	_photos - Not Directory
	_thumbnails - Not Directory
	IMG_2205.png - Not Directory
	xxx - Not Directory

Why do the directories "_photos" and "_thumbnails" and "xxx" get reported as "Not Directory"???

Also, where does the "." (dot) and ".." (dot dot) come from??

Edited December 23, 2019 by SaranacLake

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Optimizing Is_dir()

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I have approximately 50k-100k files in a directory. I'm running a script to check if any of the files are being used by the DB, if not then delete them. The problem is that I have made a quick test on a directory of just 1k files and it dies. Is there a way to optimize it? I know the script works, it's just that it takes too long to run. Even with just 1k files. And I'm pretty sure is the is_dir that's taking its sweet time. Any ideas?

<?php
require_once 'db_connect.php';

$default_dir = "storage/2011/";

if(!($dp = opendir($default_dir))) die("Cannot open $default_dir.");

while($file = readdir($dp))
{
if(is_dir($file))
{
continue;
}
else if($file != '.' && $file != '..')
{
$query = "SELECT * FROM images Where filename = '".$file."' OR thumbname = '".$file."'";
$dbResult = mysql_query($query);
$num_rows = mysql_num_rows($dbResult);
if ($num_rows == 0){

unlink($default_dir.$file);

echo $file."<br />";

}
}
}
closedir($dp);
?>