存储在mysql blob字段中的图像不会拉回PHP

Question

我将图像存储在MySql数据库Blob字段中。当我试图将它们拉回来时，我得到的图像并不起作用。如果我将它存储错误或者只是我保存它的方式有任何线索吗？

if($_FILES['damage001']['tmp_name']){
    $data = file_get_contents($_FILES['damage001']['tmp_name']);
    $data = mysql_real_escape_string($data);

    $photo1_type = protect($_POST['photo1_type']);
    $photo1_desc = protect($_POST['photo1_desc']);


    $sql = "INSERT into `tbl_osd_attachments` SET 
    `osd_id`='$id',`picture`='$data',`type`='$photo1_type', description = '$photo1_desc';";
    $query = mysql_query($sql) or die(mysql_error());
    //echo 'link to uploaded picture: <a href='.$url.'> Picture link! </a>';

    }else{ echo '<br><br>';}

拉动图片的代码：

$z2=mysql_result($result_pics,$z,"picture");

    echo "<img alt='embedded image' src='data:image/png;base64,".base64_encode($z2)."' >";

我正在从mysql切换到mysqli