php如何上传照片到数据库并回显

<script type="text/javascript" src="http://code.jquery.com/jquery-latest.js">
</script>
<script src="./aa.js"></script>
<form method="post" action="" enctype="multipart/form-data" id="form">
<input type="file" name="file" onchange="aj()" id="bnm">
<input type="submit"  name="zxing">
<img src="https://img2.baidu.com/it/u=1171791560,3850385956&fm=253&fmt=auto&app=138&f=JPEG?w=500&h=500"
alt="" id="a">
    </form>
<?php
// 连接
$servername = "localhost";
$username = "root";
$password = "123456";
$dbname = "myDB";
$conn = new mysqli($servername, $username, $password,$dbname);
// 检测连接
if ($conn->connect_error) {
    echo "<script>alert('小皮是不是没有开?')</script>";
}
// 允许上传的图片后缀
$a = array("gif", "jpeg", "jpg", "png");
// 分解后缀
$b = explode(".", $_FILES["file"]["name"]);
// 获取文件后缀名
$c = end($b);
$name = '二';
$passwordss = '123456';
// $f = $_POST['file'];
// $file = $_POST['file'];
// 插入
if (array_key_exists('zxing',$_POST)) {
$d = "upload/" . $_FILES["file"]["name"];
// copy($file,$_FILES["files"]);
echo "<br/>";
echo $f;
echo "<br/>";
    if ((($_FILES["file"]["type"] == "image/gif")
        || ($_FILES["file"]["type"] == "image/jpeg")
        || ($_FILES["file"]["type"] == "image/jpg")
        || ($_FILES["file"]["type"] == "image/pjpeg")
        || ($_FILES["file"]["type"] == "image/x-png")
        || ($_FILES["file"]["type"] == "image/png"))
        && ($_FILES["file"]["size"] < 204800)   // 小于 200 kb
        && in_array($c, $a))
        {
            if ($_FILES["file"]["error"] > 0)
            {
                echo "66666";
            }
            else
            {
                // 判断上传的东西存不存在
                if (file_exists($d))
                {
                    echo 1;
                }
                else
                {
                    // 如果 upload 目录不存在该文件则将文件上传到 upload 目录下
                    move_uploaded_file($_FILES["file"]["tmp_name"], $d);
                    echo "名字".$_FILES["file"]["name"];
                    echo "<br/>";
                    echo "类型".$_FILES["file"]["type"];
                    echo "<br/>";
                    echo "大小".$_FILES["file"]["size"];
                    echo "<br/>";
                    echo "位置".$_FILES["file"]["tmp_name"];
                    echo "<br/>";
                    $fc = "./upload/" .$_FILES["file"]["name"];
                    echo $fc;
                    $sqls = "INSERT INTO wangmou (name, password,img)VALUES('$name','$passwordss','$fc')";
                    if ($conn->query($sqls) === TRUE) {
                    echo "<center> 插入成功!</center>";
                    }else{
                        // echo "失败";
                    echo "Error: " . $sql . "<br>" . $conn->error;
                    }
                }
            }
        }
        else
        {
            echo 2;
        }
}
    ?>

function aj() {
    let forms = new FormData(document.getElementById('form'));
    console.log(1);
    console.log(forms);
    $.ajax({
        type: "POST",
        url: "./b.php",
        data: forms,
        // dataType: 'json',
        Cache: false,
        processData: false,
        contentType: false,
        success: function (res) {
            console.log(res);
            $("#a").attr("src", res);
        },
        error: function (res) {
            console.log(res);
        }
    })
}

// 向数据库中插入图片
    $imgfile=$_FILES['imgfile'];
    $submitbtn=$_POST['submitbtn'];
    if($submitbtn=='OK' and is_array($imgfile))
    {
        $name=$imgfile ['name'];  // 取得图片名称
        $type=$imgfile ['type']; // 取得图片类型
        $size=$imgfile ['size'];  // 取得图片长度
       $tmpfile=$imgfile ['tmp_name'];  // 图片上传上来到临时文件的路径
       if ($tmpfile and is_uploaded_file ($tmpfile))  // 判断上传文件是否为空，文件是不是上传的文件
        {
            // 读取图片流
            $file=fopen($tmpfile,"rb");
            $imgdata=bin2hex (fread ($file,$size));  //bin2hex () 将二进制数据转换成十六进制表示
            fclose($file);
            $mysqli=new mysqli("localhost","root","123456","myDB");  // 连接数据库函数
            // 插入出数据库语句，图片数据前要加上 0x，用于表示 16 进制数
            if(new mysqli("insert into images(name,type,image) values('".$name."','".$type."',0x".$imgdata.")"))
               echo "<center> 插入成功！<br><br><a href='disimage.php'> 显示图片 </a></center>";
            else
                echo "<center> 插入失败！</center>";
            mysql_close();
        }
        else 
            echo "<center> 请先选择图片！<br><br><a href='image.html'> 点此返回 </a></center>";
    } else 
       echo "<center> 请先选择图片！<br><br><a href='image.html'> 点此返回 </a></center>";