Upload via FTP e dimensione file

[steg@]

Ciao a tutti,
ho uno script che tramite le funzioni FTP mi carica online un file .zip

Finchè si tratta di file di 4-5 MB non c'è problema, ma se provo a mettere su un file + pesante (20mb) mi da errore e non mette su un bel niente..
Utilizzo una ADSL a 1,2 mb..

Sto utilizzando l'ottima classe WEB3FTP scaricata da phpclasses.org

<?php
/*
=============== WEB3FTP =============
Copyright Angelo Gelmi - 2004

Example 1:
Upload a file kept in your server filesystem to an another server

include "w3k.ftmp.php";
$ftpconnection = new web3ftp("hostofanotherserver","username","password");
$ftpconnection->upload("./filename.ext","/remotedirectory/filename");
$ftpconnection->close;

Example 2:
Upload a file kept in /tmp by a form upload (if your server avoid set permission 777 onto a directory) 
to a directory on the same server.

include "w3k.ftmp.php";
$ftpconnection = new web3ftp("localhost","username","password");
$ftpconnection->upload($_FILES["the_file"]["tmp_name"],"img/novita/".$_FILES["the_file"]["name"]);
$ftpconnection->close;

*/

class web3ftp {
        
    var $verbose;
    function web3ftp($ftp_server,$ftp_user,$ftp_password){
        $this->ftp_server=$ftp_server;
        $this->ftp_user=$ftp_user;
        $this->ftp_password=$ftp_password;
        
        $this->max_size=500000;
        $this->connection($this->ftp_server,$this->ftp_user,$this->ftp_password);
        $this->allowed = array ("image/jpeg","image/gif","image/png","image/psd");
        
        //$this->verbose=1;
    }
    
    //===================================
    // Make connection to server
    //===================================
    function connection(){
        //print $this->ftp_user.",".$this->ftp_password."
";
        $this->conn_id = ftp_connect($this->ftp_server); 
        $login_result = ftp_login($this->conn_id, $this->ftp_user, $this->ftp_password); 
            
        if (($this->conn_id==false) || ($login_result==false)) { 
            echo "FTP connection aborted!";
            echo "Connection to $this->ftp_server for user $this->user failed!"; 
            die; 
        } else {
            if ($this->verbose==true)
                echo "Connected at $this->ftp_server, user $this->ftp_user";
        }
    }
    
    //===================================
    // Upload File (localfile,remotefile)
    //===================================
    function upload($source_file,$destination_file){
    
        // if file name not specified alert and exit
        // otherwise make the upload
        if ((!isset($source_file))||(!isset($destination_file))){
           echo "Some mandatory file not specified!
";
           echo "Verify origin_file and destination_file.";     
        } else {
            $upload = ftp_put ($this->conn_id, $destination_file, $source_file, FTP_BINARY);
            // controllo dello stato di upload
            if ($upload==false) { 
                echo "
FTP Loading didn't succeded - SOURCE $source_file";
            } else {
                //$this->changePermission($destination_file,744);
                if ($this->verbose==true)
                     echo "
Correctly loaded file $source_file on $this->ftp_server as $destination_file";
            }
        }        
    }
    
    //===================================
    // Delete File (remotefile)
    //===================================
    function delete($destination){
        
        if (isset($destination)){
            if (@ftp_delete ( $this->conn_id, $destination)){
                if ($this->verbose==true)
                    echo "Removed $destination at $this->ftp_server";
            }else{
                //Errors
                if ($this->verbose==true)
                    echo "Some errors occourred during removing: 
".$destination;
            }
        }            
    }
    
    //===================================
    // Change Permission To File (remotefile,permission)
    //===================================
    function changePermission($file,$permission){
        if (isset($file) && isset($permission))
            return ftp_chmod ($this->conn_id,$permission,$file);
    }
    
    
    //===================================
    // Verify parameters (weigth,mime )
    //===================================
    function checkparam($inputname){
        
        $lock="";
        if($_FILES[$inputname]['size']>$this->max_size){
            $this->err = "La dimensione eccede quella massima consentita ($this->max_size byte)";
            return 1;
        }
        
        // Parsa i mime consentiti
        if (!in_array ($_FILES[$inputname]['type'], $this->allowed)){
                if ($this->verbose==true){
                    $this->err = "Il tipo di immagine non &egrave; tra quelli consentiti
";
                    $this->err .= $_FILES[$inputname]['type']."( ";
                    foreach ($this->allowed as $permitted)
                        $this->err.= "[b]".$permitted."[/b], "; 
                    $this->err .= ") ";
                    return 2; 
                }    
        }
        return 0;    
    }
    
    //===================================
    // Close connection
    //===================================
    function close(){
        ftp_quit($this->conn_id); 
    }
}


?>

Questo è il mio script:

$ftpconnection = new web3ftp("localhost","user","psw");

if(!is_file($path_dir."/".$cliente."/".$dir_name."/".$_FILES['source_file']['name'])){

$ftpconnection->upload($_FILES["source_file"]["tmp_name"],"public/area_clienti/".$cliente."/".$dir_name."/".$_FILES["source_file"]["name"]);

$ftpconnection->close;

//etc etc 

C'è forse qualche funzione x settare il tempo di esecuzione dei files??