php表单提交与$_POST实例分析

<form action="b.php" method="post">
用户名<input type="text" name="username"><br />
密码<input type="password" name="pwd"><br />
性别<input type="radio" name="sex" value="男">男<input type="radio" name="sex" value="女">女<br />
爱好<input type="checkbox" name="hobby['sing']" value="唱歌">唱歌<input type="checkbox" name="hobby['book']" value="读书">读书<input type="checkbox" name="hobby['movie']" value="电影">电影<input type="checkbox" name="hobby['tour']" value="旅游">旅游<br />
家乡<select name="city">
<option value="北京">北京</option>
<option value="上海">上海</option>
</select><br />
个人简介<textarea rows="5" cols="30" name="info"></textarea><br>
<!--上传照片<input type="file" name="photo"><br />-->
<input type="submit" value="提交">
</form>

<?php
echo "<pre>";
print_r($_POST);
?>