CakePHPImgUpload.php

public function uploadImage($filename, $document, $path)
    {
        $ext = $this->Img->ext($document['name']);
        $origFile = $filename. '.'. $ext;
        $targetDir = WWW_ROOT . $path;
        $upload = $this->Img->upload($document['tmp_name'], $targetDir, $origFile);
        if ($upload == 'Success') {
            return 'category/'.$origFile;
        }
        return false;
    }