表单提交后，PHP ::单选按钮值始终设置为“打开”

Here is my form:

<form method="post" enctype="multipart/form-data">
<input type="radio" name="sex" value="male" checked />
<input type="radio" name="sex" value"female"/>
<input type="submit" name="btn">
</form>

$_POST['sex'] = always I see the below output for the radio button:

See = string 'on'

It always gives "on" instead of male or female. This is what I have put in the form.

Am I doing something wrong here?

Please help.

If I use SELECT box, then it works well. But I need to make it work using radio button.

<form method="post" enctype="multipart/form-data">
Male : <input type="radio" name="sex" value="male" checked /><br/>
Female : <input type="radio" name="sex" value="female"/><br/>
<input type="submit" name="btn">
</form>

<?php
error_reporting(0);
echo $_REQUEST['sex'];
?>

Above code is working, Changes

value = female

you forgot to add = sign

<input type="radio" name="sex" value="female"/>

you didn't put equal to sign near female.