//data 为提交表单数据，数组格式
$data = $_POST["data"];
$data = filter( $data );  //转换data 数据
//  剩下的事件，插入数据库，生成静态贴之类。。。

//转换处理
function filter( $data )
{
    if( sizeof($data ))
    {
        foreach ($data   as $key => $val):
            if(preg_match_all("/<img\s+src=\"data:image\/png;base64,([^\"]+)\"/iU" , $val ,$match))
            {
                if(sizeof($match[1]))
                {
                    foreach ($match[1] as $key2 => $val2):
                        list($newFilePath, $newFileName) = create_png_name();
                        file_put_contents($newFilePath , base64_decode($val2) );

                        $val = str_replace("<img src=\"data:image/png;base64,$val2\"" ,"<img src = '$newFileName'" , $val );
                      //  echo $val;
                    endforeach;
                }
                $data[$key] = $val;
            }
         endforeach;
    }
    return $data;
}

function create_png_name()
{
    $fileName = "/upload/attached/".date("Y-m-d")."/".date("ymdhis").rand(1000,9999).".jpg";
    $file = $_SERVER["DOCUMENT_ROOT"] . $fileName ;
    $dir = pathinfo( $file , PATHINFO_DIRNAME );
    if( !is_dir($dir  )) { mkdir( $dir   , 0777 , 1);}
     return array($file , $fileName);
}