Changing the name of a tmp file uploaded through a form

, , $name , $username - , $id , , mime , , , , , php, , , :

<?php 

if($_SERVER['REQUEST_METHOD']=='POST' && isset($username) && is_numeric($id)
&& isset($_FILES['myfile']['error']) && $_FILES['myfile']['error']=='UPLOAD_ERR_OK'){

    $name    = basename($_FILES['myfile']['name']);
    $ext     = end(explode('.', $name));
    $move_to = "images/avatars/".preg_replace('/[^a-zA-Z0-9.-]/s', '_',$username).'.'.$ext;
    $info    = getimagesize($_FILES['myfile']['tmp_name']);

    //not more then 200px
    if($info[0]>200 || $info[1] > 200){
        //file too large
    }

    $allowed = array('image/png','image/jpg','image/gif');
    if($info[0]>0 && $info[1] > 0 && in_array($info['mime'],$allowed)){
        move_uploaded_file($_FILES['myfile']['tmp_name'],$move_to);
        mysql_query("UPDATE users
                     SET avatar='".mysql_real_escape_string($move_to)."' 
                     WHERE id=".$id." AND owner='".$_SESSION['username']."'");
        $avaMessage = 'Avatar Updated - Uploaded Image!.';
    }else{
        //Not allowed
    }
}
?>

<form action="" method="POST" enctype="multipart/form-data">
     <!--1 MB = 1048576 bytes-->
     <input type="hidden" name="MAX_FILE_SIZE" value="1048576" />

     <p>Upload your image:<p /><input type="file" name="myfile"></p><br />
     <p><input type="radio" name="type" value="defaultDot">Use Default</p>
     <p><input type="submit" name="updateAvatar"></p>
</form>

<?php 
Class updateUserAvatar{
    public $upload_path;
    public $full_path;
    public $name;
    public $size;
    public $ext;
    public $output;
    public $input;
    public $prefix;
    private $allowed;

    function upload(){
        if($_SERVER['REQUEST_METHOD'] == 'POST'){
            if(isset($_FILES[$this->input]['error'])){
                if($_FILES[$this->input]['error'] == 0){
                    $this->name      = basename($_FILES[$this->input]['name']);
                    $file_p          = explode('.', $this->name);
                    $this->ext       = end($file_p);
                    $this->full_path = rtrim($this->upload_path,'/').'/'.preg_replace('/[^a-zA-Z0-9.-]/s', '_', $this->prefix).'.'.$this->ext;
                    $info            = getimagesize($_FILES[$this->input]['tmp_name']);
                    $this->size      = filesize($_FILES[$this->input]['tmp_name']);

                    if($info[0]>$this->allowed['dimensions']['width'] || $info[1] > $this->allowed['dimensions']['height']){
                        $this->output = 'File dimensions too large!';
                    }else{
                        if($info[0] > 0 && $info[1] > 0 && in_array($info['mime'],$this->allowed['types'])){
                            move_uploaded_file($_FILES[$this->input]['tmp_name'],$this->full_path);
                            $this->output = 'Upload success!';
                        }else{
                            $this->output = 'File not supported!';
                        }
                    }
                }else{
                    if($_FILES[$this->input]['error']==1){$this->output = 'The uploaded file exceeds the upload_max_filesize directive!';}
                    if($_FILES[$this->input]['error']==2){$this->output = 'The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in our HTML form!';}
                    if($_FILES[$this->input]['error']==3){$this->output = 'The uploaded file was only partially uploaded!';}
                    if($_FILES[$this->input]['error']==4){$this->output = 'No file was uploaded!';}
                    if($_FILES[$this->input]['error']==6){$this->output = 'Missing a temporary folder!';}
                    if($_FILES[$this->input]['error']==7){$this->output = 'Failed to write uploaded file to disk!';}
                    if($_FILES[$this->input]['error']==8){$this->output = 'A PHP extension stopped the file upload!';}
                }
            }
        }
    }

    function setPath($var){
        $this->upload_path = $var;
    }
    function setAllowed($var=array()){
        $this->allowed = $var;
    }
    function setFilePrefix($var){
        $this->prefix = preg_replace('/[^a-zA-Z0-9.-]/s', '_', $var);
    }
    function setFormInput($var){
        $this->input = $var;
    }
}//END CLASS


if($_POST['type'] != "defaultDot"){
    //Setup
    $upload = new updateUserAvatar();
    $upload->setPath('./images/avatars/');
    $upload->setFilePrefix($username);
    $upload->setAllowed(array('dimensions'=>array('width'=>200,'height'=>200),
                              'types'=>array('image/png','image/jpg','image/gif')));
    $upload->setFormInput('myfile');
    $upload->upload();

    if($upload->output == 'Upload success!'){
        //do query
        $updateURL = mysql_query("UPDATE users SET avatar='$upload->full_path' WHERE id=$id");
    }
    //message
    $avaMessage = $upload->output;
}else{
    $avaURL = 'images/avatars/default.png';
    $updateURL = mysql_query("UPDATE users SET avatar='$avaURL' WHERE id=$id");
    $avaMessage = '<p><font size=2 color=aqua face=Tahoma>Avatar Updated - Default.</font></p>';
}
?>