CakePHP file upload

cakefileupload.php

    //in upload.ctp,
    <?php echo $this->Form->input('proxyfile',array('type' => 'file', 'class' => 'btn btn-default btn-file')) ?>
    
    //in controller
public function upload(){
    $filename = WWW_ROOT . "/files/".$this->data['Proxy']['proxyfile']['name'];

   /* copy uploaded file */
			if (move_uploaded_file($this->data['Proxy']['proxyfile']['tmp_name'],$filename)) {
				/* save message to session */
				$this->Session->setFlash('File uploaded successfuly. You can view it <a href="/app/webroot/files/'.$this->data['Proxy']['proxyfile']['name'].'">here</a>.');
				/* redirect */
				$this->redirect(array('action' => 'index'));
			} else {
				/* save message to session */
				$this->Session->setFlash('There was a problem uploading file. Please try again.');
			}
}