php上传图片

DS 当前系统的目录分隔符
THINK_PATH 框架系统目录 
ROOT_PATH 框架应用根目录

uniqid() 函数基于以微秒计的当前时间，生成一个唯一的 ID。

//********************************base64图片处理
    public function base64_image_content($base64_image_content)
    {
//        $base64_image_content="data:image/jpeg;base64,iVBOxxxx"
        //匹配出图片的格式
        if (preg_match('/^(data:\s*image\/(\w+);base64,)/', $base64_image_content, $result)) {
            $type = $result[2];//图片后缀
            $new_file =ROOT_PATH . 'public' . DS ;
            $url='/upimages/'. date("Ymd", time()) . "/";
            $new_file=$new_file.$url;
            if (!file_exists($new_file)) {
                //检查是否有该文件夹，如果没有就创建，并给予最高权限
                mkdir($new_file, 0777,true);
            }
            $filename = time() . '_' . uniqid() . ".{$type}"; //文件名
            $new_file = $new_file . $filename;
            $url=$url.$filename;
            //写入操作
            if(file_put_contents($new_file, base64_decode(str_replace($result[1], '', $base64_image_content)))) {
                return  $url;
            }else{
                return false;
            }
        }
        else {
            return false;
        }
    }
　　　//普通图片上传
    public function upload()
    {
        header('Content-Type:application/json');
        if($_FILES){
            $file = $_FILES['file'];
            $temp_arr = explode(".", $file['name']);
            $file_ext = array_pop($temp_arr);
            $file_ext = trim($file_ext);
            $file_ext = strtolower($file_ext);
            $file_name = rand(1, 9999) . time() . '.' . $file_ext;
            $tmp_file = $file['tmp_name'];
            $error = $file['error'];

            if($error == 0){
                $date_path = '/material/upload/'.date('Ymd');
                $path_url = $date_path .'/'. $file_name;
                $dir_url = ROOT_PATH . 'public' . $date_path;
                if(!file_exists($dir_url)){
                    mkdir($dir_url,0777,true);
                }
                $move_url = $dir_url . DS . $file_name;
//                $path_url = mb_convert_encoding($path_url,'UTF-8','UTF-8');
                move_uploaded_file($tmp_file, $move_url);
//                return '{"code":1,"msg":"操作成功","data":"'.$path_url.'"}';
                return $path_url;
            }
        }
        return false;
    }