请教同一个文件中php如何获取html的变量值?

代码如下：

<html>

	<head> <title>配置器</title> </head>

	<body>

		<br> 请设置您要修改的属性：<br> 

		<form>

			<table width="220" height="10" border="0" cellpadding="1" cellspacing="1">  

					<tr> 

						<td align="center">金币: </td> 

						<td align="center"><input name=jb type=TEXT value="555"></td> 

					</tr><tr> 

						<td align="center">经验：</td> 

						<td align="center"><input name=jy type="TEXT" value="444" /></td> 

					</tr><tr> 

						<td align="center">道具：</td> 

						<td align="center"><input name=dj type="TEXT" value="333" /></td> 

					</tr>

					<input type=SUBMIT value="测试">

			</table>  

		</form>

	</body>



	<?php

    echo "</br>test connect.</br>"; 

		echo ($jb);

		echo ($jb);

		echo ($jy);

	?>



</html> 

在浏览器打开这个index.php页面后 显示错误

Notice: Undefined variable: jb in C:\Program Files (x86)\EasyPHP-DevServer-14.1VC11\data\localweb\command.php on line 32

Notice: Undefined variable: jb in C:\Program Files (x86)\EasyPHP-DevServer-14.1VC11\data\localweb\command.php on line 33

Notice: Undefined variable: jy in C:\Program Files (x86)\EasyPHP-DevServer-14.1VC11\data\localweb\command.php on line 34

我该如何在php代码中获取html的变量值了？