php script to delete files older than 24 hrs, deletes all files

Question

I wrote this php script to delete old files older than 24 hrs, but it deleted all the files including newer ones:

Answer 1

 86400){
    unlink($file);
    }
}

?>

You can also specify file type by adding an extension after the * (wildcard) eg

For jpg images use: glob($dir."*.jpg")

For txt files use: glob($dir."*.txt")

For htm files use: glob($dir."*.htm")