php单选框怎么绑定，html中设置两个复选框怎么设置？
> <!DOCtype HTML>
>
> <html lang="en">
>
> <head>
>
> <meta charset="UTF-8">
>
> <title>html设置复选框、单选框</title>
>
> </head>
>
> <body>
>
> <form name="from1" id="form1" action="upload.php">
>
> <label>性别：</label>
>
> <input type="radio" name="sex" value='male'/><label>男</label>
>
> <input name="sex" checked type="radio" value="female"/><label>女</label>
>
> <input name="sex" type="radio" value="gay"/><label>同性恋</label>
>
> <br>
>
> <label>科目：</label>
>
> <input name='subject' type="checkbox" value="Chinese"><label>语文</label>
>
> <input name='subject' type="checkbox" checked value="Math" ><label>数学</label>
>
> <input name='subject' type="checkbox" checked="checked" value="English"/><label>英语</label>
>
> <input name='subject' type="checkbox" checked value="Sport"/><label>体育</label>
>
> </form>
>
> </body>
>
> </html>