</head>
<body>
<form method="POST" action="demo10.php">
username:<input type="text" name="username" />
<input type="submit" value="submit" />
</form>
</body>
</html>

六.字符串连接用.

<?php
echo "the student name is ：".$_POST['username'];
echo "<br/>";
echo "welcome to "."school";
?>