Upload files example Cakephp + CRUD

ExampleController.php

<?php
App::uses('AppController', 'Controller');
App::uses('Folder', 'Utility');
App::uses('File', 'Utility');
App::uses('CakeTime', 'Utility');


class ExampleController extends AppController {

	public static $accept_types = array(
		'pdf' => 'application/pdf', 
		'doc' => 'application/msword', 
		'xls' => 'application/vnd.ms-excel', 
		'ppt' => 'application/vnd.ms-powerpoint', 
		'docx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
		'xlsx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
		'pptx' => 'application/vnd.openxmlformats-officedocument.presentationml.presentation',
		'ppsx' => 'application/vnd.openxmlformats-officedocument.presentationml.slideshow',
	);

	public function implementedEvents() 
	{
		return parent::implementedEvents() + array(
			'Crud.beforeSave' => '_beforeSave',
		);
	}

	public function _beforeSave(CakeEvent $event) 
	{
		$root_folder = WWW_ROOT.'files'.DS.'uploads/TONFOLDER';
		$folder_site = new Folder($root_folder, true, 0755);

		if ( !empty($this->request->data[$this->modelClass]['CHAMPS_FICHIER']['tmp_name']) && is_uploaded_file($this->request->data[$this->modelClass]['CHAMPS_FICHIER']['tmp_name']) ) 
		{
			$file_tmp = new File($this->request->data[$this->modelClass]['CHAMPS_FICHIER']['tmp_name']);
			$type_mime = $file_tmp->mime();
			
			if(in_array($file_tmp->mime(), ExampleController::$accept_types))
			{
			    $file_origin = new File($this->request->data[$this->modelClass]['CHAMPS_FICHIER']['name']);
			    $filename = Inflector::slug($file_origin->name()).'.'.$file_origin->ext();

			    $file_real = new File($folder_site->path.DS.$filename);
			    if($file_real->exists())
			    {
			    	$filename = Inflector::slug(md5( time().$file_origin->name() )).'.'.$file_origin->ext();
			    }

			    move_uploaded_file(
			        $this->data[$this->modelClass]['CHAMPS_FICHIER']['tmp_name'],
			        $folder_site->path.DS.$filename
			    );

			    $this->request->data[$this->modelClass]['CHAMPS_FICHIER'] = $filename;
			    $this->request->data[$this->modelClass]['mime'] = $type_mime;
			    $this->request->data[$this->modelClass]['extfile'] = array_search($type_mime, ExampleController::$accept_types);

			    return true;
			}
			else 
			{
				unset($this->request->data[$this->modelClass]['CHAMPS_FICHIER']);
				$this->Session->setFlash(__('Only file type Power Point, Word or PDF please'),'default',array('class' => 'error'));
				
				if(isset($this->request->data[$this->modelClass]['id']))
				{
					$this->redirect(array(
						'action' => 'edit',
						$this->request->data[$this->modelClass]['id'],
			 		));
				}
				else
				{
					$this->Session->write('data', $this->request->data);
					$this->redirect(array(
						'action' => 'add',
			 		));
				}
			}
		}
		else 
		{
			unset($this->request->data[$this->modelClass]['CHAMPS_FICHIER']);
			return false;
		}
	}

}