<?$dir = new DirectoryIterator($_SERVER['DOCUMENT_ROOT']."/folder1/folder2");
foreach ($dir as $fileinfo) {
    if (!$fileinfo->isDot()) {
        if ($fileinfo->isFile())
         var_dump($fileinfo->getFilename());
         //   echo $fileinfo->getExtension(); ->suffix
    }
}

// read file

$handle = @fopen("/tmp/inputfile.txt", "r");
if ($handle) {
    while (($buffer = fgets($handle, 4096)) !== false) {
        echo $buffer;
    }
    fclose($handle);
}