Question

我不知道标题位置部分有什么问题，但是由于哪个页面获得无限重定向而在某个时间后停止会有一些错误。这是我的代码，当我选择一个pic以便它应该重定向到Facebook制作封面或制作个人资料页面，但它会继续循环重定向。

<?php
include_once("inc/facebook.php"); //include facebook api library

######### edit details ##########
$appId = ''; //Facebook App ID
$appSecret = ''; // Facebook App Secret
$return_url = 'http://www.mysite.com/testing/process.php';  //return url (url to script)
$homeurl = 'http://www.mysite.com/testing';  //return to home
$fbPermissions = 'publish_stream,user_photos';  //Required facebook permissions
##################################



$GetPicId = $_GET["pid"]; // Picture ID from Index page
$PicLocation ='';

/*
Users do not need to know original location of image.
I think it's better to get image location from database using ID.
for demo here i'am using PHP switch.
*/
switch($GetPicId)
{
case 1:
    $PicLocation = 'cover_pics/cover1.jpg';
    break;
case 2:
    $PicLocation = 'cover_pics/cover2.jpg';
    break;
case 3:
    $PicLocation = 'cover_pics/cover3.jpg';
    break;
default:
    header('Location: ' . $homeurl);
    break;
}

//Call Facebook API
$facebook = new Facebook(array(
'appId'  => $appId,
'secret' => $appSecret,
'fileUpload' => true,
'cookie' => true
));

//get user
$fbuser = $facebook->getUser();
$access_token = $facebook->getAccessToken();

//variables we are going to post to facebook
$msg_body = array(
'access_token' => $access_token,
'message' => 'I liked this pic from '. $homeurl .' it is perfect for my cover photo.',
'source' => '@'.realpath($PicLocation)
);

if ($fbuser){ //user is logged in to facebook, post our image
try {
$uploadPhoto = $facebook->api('/me/photos', 'post', $msg_body );
} catch (FacebookApiException $e) {
echo $e->getMessage(); //output any error
}
}else{
$loginUrl =   $facebook->getLoginUrl(array('scope'=>$fbPermissions,'return_url'=>$return_url));
header('Location: ' . $loginUrl);
}

if($uploadPhoto)
{
/*
image is posted in user facebook account, but still we need to send user to facebook
so s/he can set cover or profile picture!
*/

//Get url of the picture just uploaded in user facebook account
$jsonurl = "https://graph.facebook.com/".$uploadPhoto["id"]."&?access_token=".$access_token;
$json = file_get_contents($jsonurl,0,null,null);
$json_output = json_decode($json);

/*
We can not set facebook cover or profile picture automatically yet,
So, the trick is to post picture into user facebook account first
and then redirect them to a facebook profile page where they just have to click a button to set it.
*/
echo '<html><head><title>Update Image</title>';
echo '<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />';
echo '<link href="style.css" rel="stylesheet" type="text/css" />';
echo '</head><body>';
echo '<div align="center" class="fbpicwrapper">';
echo '<h1>Image is sent to your facebook account!</h1>';
echo '<div class="fbpic_desc">Click on desired button you want to do with this image!</div>';
echo '<div class="option_img"><img src="'.$json_output->source.'" /></div>';

/*
Links (buttons) below will send user to facebook page,
where they just need to crop or correct propertion of image and hit apply button.
*/
echo '<a class="button" target="_blank" href="http://www.facebook.com/profile.php?preview_cover='.$uploadPhoto["id"].'">Make Your Profile Cover</a>';
echo '<a class="button" target="_blank" href="http://www.facebook.com/photo.php?fbid='.$uploadPhoto["id"].'&type=1&makeprofile=1&makeuserprofile=1">Make Your Profile Picture</a>';
echo '<a class="button" href="'.$homeurl.'">Back to main Page.</a>';
echo '</div>';
echo '</body></html>';
}

?>

Answer 1

在使用echo重定向之前，删除所有打印到输出的header(Location...)或任何空格。在您开始打印输出后，重定向将无效。

这样做的方法是将所有要打印的内容保存到字符串中，以防没有重定向，只在最后将其打印到屏幕上。

Answer 2

您在2行中使用header方法，可以在2次内通过某些真实条件运行。它可以循环。

如果switch与任何情况都不匹配，且$fbuser同时等于false。

第一个header方法：

default:
    header('Location: ' . $homeurl);
    exit(); //added
    break;

其他header方法：

if ($fbuser){ 
    //user is logged in to facebook, post our image
}
else {
    $loginUrl = $facebook->getLoginUrl(array('scope' => $fbPermissions, 'return_url' => $return_url));
    header('Location: ' . $loginUrl);
    exit(); //added

页面没有使用php中的标头正确重定向

2 个答案: