PHPで画像をデータベースにアップロードする方法

$conn = @mysql_connect('localhost' , 'userName' , 'passWord') or die(mysql_error()); //连接数据库
mysql_query('set names utf8' , $conn); //设置连接字符集
@mysql_select_db('user' , $conn) or die(mysql_error()); //连接数据表

<form action="register.php" method="post"  enctype="multipart/form-data">
	<dl class="admin_login">
		<dd class="pic">
			<img src="img/5.png" alt="" id="preview"/>
			<a href="javascript:;" class="a-upload">
				<input type="file" name="photo" id="" οnchange="imgPreview(this)">上传头像
			</a>
		</dd>
		<dd class="email_icon">
			<input type="text" placeholder="请输入注册邮箱" name="email" class="login_txtbx">
		</dd>
		<dd class="name_icon">
			<input type="text" placeholder="请输入帐号昵称" name="name" class="login_txtbx">
		</dd>
		<dd class="phone_icon">
			<input type="tel" placeholder="请输入联系号码" name="phone" class="login_txtbx">
		</dd>
		<dd class="school_icon">
			<select name="school">
				<option value="0">请选择报研学校</option>
				<option value="1">中南大学</option>
				<option value="2">电子科技大学</option>
				<option value="3">上海交通大学</option>
				<option value="4">华南理工大学</option>
			</select>
		</dd>
		<dd class="pwd_icon">
			<input type="password" placeholder="请输入您的密码" name="password" class="login_txtbx">
		</dd>
		<dd class="rpwd_icon">
			<input type="password" placeholder="请确认您的密码" class="login_txtbx">
		</dd>
		<dd>
			<input type="submit" value="立即注册" class="submit_btn">
		</dd>
	
	</dl>
</form>

<?php
	require(&#39;conn.php&#39;);
		
	if(empty($_POST)){
		require(&#39;register.html&#39;);
	}else{			  
		$image = mysql_real_escape_string(file_get_contents($_FILES[&#39;photo&#39;][&#39;tmp_name&#39;])); //获取图片
		$image_type = $_FILES[&#39;photo&#39;][&#39;type&#39;]; //获取图片格式
		$user_name = $_POST[&#39;name&#39;];
		$user_email = $_POST[&#39;email&#39;];
		$user_phone = $_POST[&#39;phone&#39;];
		$user_school = $_POST[&#39;school&#39;];
		$password = $_POST[&#39;password&#39;];
 
		$sqlstr = "insert into user(uname,email,phone,password,school,photo,type) values(&#39;".$user_name."&#39;,&#39;".$user_email."&#39;,&#39;".$user_phone."&#39;,&#39;".$password."&#39;,&#39;".$user_school."&#39;,&#39;".$image."&#39;,&#39;".$image_type."&#39;)";  
		  
		@mysql_query($sqlstr) or die(mysql_error()); //执行sql语句，若执行成功，继续下面跳转页面。若执行失败，提示错误信息  
    		header(&#39;location:login.php&#39;); //跳转页面
		exit();  			
	}
?>