Incrémenter une variable

$action 	= 'new';
$a 			= !empty($_GET['a']) ? $_GET['a'] : NULL;
$submit 	= !empty($_POST['submit']) ? $_POST['submit'] : NULL;
$haction 	= !empty($_POST['haction']) ? $_POST['haction'] : NULL;

$idfoto 	= !empty($_REQUEST['idfoto']) ? $_REQUEST['idfoto'] : NULL;
$datefoto 	= !empty($_POST['datefoto']) ? dw2m($_POST['datefoto']) : '';
$lieufoto 	= !empty($_POST['lieufoto']) ? strtoupper($_POST['lieufoto']) : '';
$descfoto 	= !empty($_POST['descfoto']) ? ucwords($_POST['descfoto']) : '';
$files 		= !empty($_FILES['namefoto']) ? $_FILES['namefoto'] : '';
$fileName 	= !empty($files['name']) ? $files['name'] : '';
$fileTemp 	= !empty($files['tmp_name']) ? $files['tmp_name'] : '';

switch($a) {
	case 'new': $action = 'new';  break; 
	default   : $action = 'new';  break; 
}

if($submit) {

	switch($haction) {
		case 'new':
			
			if(!is_dir('/home/azert/www/upload/albulle/data/photos/'.date("Y", strtotime($datefoto)).'/'.$lieufoto.'/')) {
				mkdir('/home/azerty/www/upload/albulle/data/photos/'.date("Y", strtotime($datefoto)).'/'.$lieufoto.'/', 0755, true);
			}

			$dossier = '/home/azerty/www/upload/albulle/data/photos/'.date("Y", strtotime($datefoto)).'/'.$lieufoto.'/';

			for ($i = 0; $i < count($fileName); $i++) {
				$ext_valide = array('jpg', 'gif', 'png', 'jepg', 'bmp');
				$ext_upload = strtolower(  substr(  strrchr($fileName[$i], '.')  ,1)  );
				if (in_array($ext_upload,$ext_valide)) {
					$TmpFile = $fileTemp[$i];
					$filePath = "$dossier/" . date('d-m-Y-H-i-s').'-'.$fileName[$i];
					if (move_uploaded_file($TmpFile, $filePath)) {
						$typenr = "enregistré";
						$success = "<span class='success'>La nouvelle photo du - ".dFR("$datefoto")." - a été $typenr.</span>";
					}
				} else {
					$erreur = "<span class='erreur'>Seuls les fichiers images sont autorisés!</span>";
				}
			} 
		break;
	}
}