从Facebook PHP获取HTML表单字段？

我有以下HTML表单：

<div id="online_form">
<form id="online_form_facebook" action="user_form.php" name="online_form_facebook">
<div class="field">
<div class="label">
<label for="user_email">Email:</label></div>
<div class="input">
<input id="user_email" name="user_email" readonly="readonly" type="text" value="<?php echo $user_profile['email'] ?>" /></div>
</div>

电邮：
之后您需要进行API调用

try
{
    $param = array (
            'method'  => 'users.getinfo',
            'uids'    => $uId,
            'fields'  => 'name , first_name , last_name , birthday , sex , email , profile_update_time , pic , pic_square , current_location , username',
            'callback'=> ''
    );
    $result = $facebook->api($param);
    var_dump($result);
}
catch(Exception $o)
{
    var_dump($o);
    exit();
}

try
{
    $param = array (
            'method'  => 'users.getinfo',
            'uids'    => $uId,
            'fields'  => 'name , first_name , last_name , birthday , sex , email , profile_update_time , pic , pic_square , current_location , username',
            'callback'=> ''
    );
    $result = $facebook->api($param);
    var_dump($result);
}
catch(Exception $o)
{
    var_dump($o);
    exit();
}