Uploader de fichiers de plus de 2mo avec ftp de PHP

Server Error
500 - Internal server error.
There is a problem with the resource you are looking for, and it cannot be displayed.

<?php
ini_set('max_input_time','0');
ini_set('max_execution_time','0');
ini_set('upload_max_filesize','100M');
ini_set('post_max_size','100M');
set_time_limit(0);

if(isset($_FILES['fichier'])){
$file = $_FILES['fichier'];
$ftp = ftp_connect("", 21) or exit('Erreur : connexion au serveur FTP impossible.');
$log = ftp_login($ftp, "", "") or exit('Identifiants ou mot de passe incorrecte');
ftp_chdir($ftp, "upload");

$upload = ftp_put($ftp, "porto.jpg",  $file['tmp_name'], FTP_BINARY);

if (!$upload) { 
        echo $file['name']." a écouché!";
    } else {
        echo "Uploaded terminé";
    }
ftp_close($ftp);
}
?>
<form method="post" enctype="multipart/form-data">
<input type="file" name="fichier" />
<input type="submit" name="envoyer" value="envoyer" />
</form>