(PHP)html格式中不同值的不同值

我有一个带两个单选按钮的联系表格.但我需要根据所选的单选按钮向客户端显示消息.
我会尝试更好地解释：
如果客户选择YES单选按钮并按提交,则会显示一条消息“太棒了！我看到你了！”我将收到一封包含所选选项的电子邮件.与NO单选按钮相同,但它会显示为“来电……”作为消息.

这是我的PHP：

<?PHP
if(isset($_POST['enviar'])) {
    $remetente = "[e-mail]"; 
    $destinatario = "[e-mail]";
    $assunto = "Subject";
    $data = date("d/m/y");
    $hora = date("H:i");
    $charset = $_POST['charset'];
    $nome = $_POST['nome'];
    $email = $_POST['email'];

    //This is the radio button value that i want to put conditionals.
    $rsvp = $_POST['rsvp'];
    $navegador = $_SERVER['HTTP_USER_AGENT'];
    $ip = $_SERVER['REMOTE_ADDR'];
    $corpo = utf8_decode("Data: ".$data."<br />Hora: ".$hora."<br />Nome: ".$nome."<br />E-mail: ".$email."<br />Ip: ".$ip."<br />browser: ".$navegador."<br />RSVP: ".$rsvp."\r\n");

    $headers = "MIME-Version: 1.0\r\n";
    $headers .= "Content-type: text/html; charset=".$charset."\r\n";
    $headers .= "Reply-To: ".$remetente."\r\n";

    $headers .= "From: ".$remetente."\r\n";


    //This is the part that i think it has to be changed.
    if(mail($destinatario, $assunto, $corpo, $headers)) {
        echo '<Meta http-equiv="refresh" content=0;url=message_sended.PHP/>';
    } else {
        echo '<Meta http-equiv="refresh" content=0;url=error.PHP/>';
    }
} else {
    echo '<Meta http-equiv="refresh" content=0;url=error.PHP/>';
}
?>

我试过这个,但是没有用：

    if(mail($destinatario, $assunto, $corpo, $headers) ) {
        if($rsvp = 'YES'){
            echo '<Meta http-equiv="refresh" content=0;url=message_sended_YES.PHP/>';
        } else {
            echo '<Meta http-equiv="refresh" content=0;url=error.PHP/>';
        }
    } else {
        echo '<Meta http-equiv="refresh" content=0;url=error.PHP/>';
    }

    if($rsvp = 'NO'){
        echo '<Meta http-equiv="refresh" content=0;url=message_sended.PHP_NO/>';
    } else {
        echo '<Meta http-equiv="refresh" content=0;url=error.PHP/>';
    }
} else {
    echo '<Meta http-equiv="refresh" content=0;url=error.PHP/>';
}

然后我这样做了：

if(mail($destinatario, $assunto, $corpo, $headers)) {
    if($rsvp == 'sim'){
        echo '<Meta http-equiv="refresh" content=0;url=sim.PHP>';
    } 
    else
    {
        echo '<Meta http-equiv="refresh" content=0;url=contato_mensagem_erro.PHP>';
    }
}   
else 
{
    echo '<Meta http-equiv="refresh" content=0;url=contato_mensagem_erro.PHP>';
}

if($rsvp == 'nao'){
    echo '<Meta http-equiv="refresh" content=0;url=nao.PHP>';
} 
else
{
    echo '<Meta http-equiv="refresh" content=0;url=contato_mensagem_erro.PHP>';
}
}   
else 
{
echo '<Meta http-equiv="refresh" content=0;url=contato_mensagem_erro.PHP>';
}

不管用.实际上,当用户选择“否”单选按钮时,他会收到正确的消息,但是当他选择“是”单选按钮时,他会收到错误的消息(错误消息),但我通常会收到表单电子邮件…

编辑
好！有用！
我是这样做的：

if(mail($destinatario, $assunto, $corpo, $headers)) {

if($rsvp == "sim"){

   echo 

     header('Location: sim.PHP/');

} 

else

{

   echo "<Meta http-equiv='refresh' content=0;url=contato_mensagem_erro.PHP>";

}

}   

else 

{

   echo "<Meta http-equiv='refresh' content=0;url=contato_mensagem_erro.PHP>";

}

if($rsvp == "nao"){

   echo header('Location: nao.PHP/');

} 

else

{

   echo "<Meta http-equiv='refresh' content=0;url=contato_mensagem_erro.PHP>";

}

}   

else 

{

   echo "<Meta http-equiv='refresh' content=0;url=contato_mensagem_erro.PHP>";

}

我真的不知道它是否正确编码,但它正在工作……

解决方法:

这些线将导致意想不到的结果：

if($rsvp = 'YES'){
if($rsvp = 'NO'){

此方法只需将$rsvp的值分别设置为“YES”和“NO”.要测试等价,您应该使用比较运算符==：

if($rsvp == 'YES'){

和

if($rsvp == 'NO'){