Mine

<?php
require_once( "./class/ini_manager.php" );
$iniMANAGER = new ini_manager();

$dir= "./ini/";

$lista=array();
if ($handle = opendir($dir)) {
while (false !== ($file = readdir($handle))) {
        if ($file != "." && $file != "..") {
			$ininome = $iniMANAGER->get_entry( "$dir$file", "geral", "nome");
			$inidata = $iniMANAGER->get_entry( "$dir$file", "geral", "data");
			$initipo = $iniMANAGER->get_entry( "$dir$file", "geral", "tipo");
			$inificheiro = $iniMANAGER->get_entry( "$dir$file", "geral", "ficheiro");
			$iniduracao = $iniMANAGER->get_entry( "$dir$file", "geral", "duracao");	
			$inihtml = $iniMANAGER->get_entry( "$dir$file", "geral", "html");		

		$lista[] = $ininome ;
		$datas[] = $inidata ;
		}
    }
    closedir($handle);
}	

sort( $lista ); 
 
foreach( $lista AS $key=>$value ) {
  ( array_key_exists( (int)$key + 1 ) ) ? $next_playlist = (int)$key + 1 : $next_playlist = 0;
  $array_de_playlists[] = $key + "-" + $next_playlist;
}
 
print( "<pre>" );
var_dump( $array_de_playlist );
die; 

?>