wp_redirect 不工作

Question

我正在尝试发布到页面并在帖子中插入一些 wordpress，但不知何故重定向不起作用，之后。我尝试了以下三个选项：

1. wp_redirect($location);
2. wp_safe_redirect($location);
3. header('Location:http://example.com');

这是我想做的：

1. 发布到另一个页面。
2. 查找要上传的文件和上传目录
3. 上传文件。
4. 使用 set_post_thumbnail 设置帖子缩略图
5. 重定向到所需页面。

脚本一直工作到设置缩略图然后死掉。 如果有人想用它从模板前端上传缩略图，他们可以使用它。

---

// if you have this in a file you will need to load "wp-load.php" to get access to WP functions. If you post to "self" with this code then WordPress is by default loaded
    require $_SERVER['DOCUMENT_ROOT'] . "/wp-load.php";
    // require two files that are included in the wp-admin but not on the front end. These give you access to some special functions below.
    require $_SERVER['DOCUMENT_ROOT'] . "/wp-admin/includes/file.php";
    require $_SERVER['DOCUMENT_ROOT'] . "/wp-admin/includes/image.php";

    // required for wp_handle_upload() to upload the file
    $upload_overrides = array( 'test_form' => FALSE );

    global $current_user;
    get_currentuserinfo();
    $logged_in_user = $current_user->ID;

    //get user POST information
    global $post;
    $loop = new WP_Query( array( 
                            'posts_per_page' => 1, 
                            'post_type' => "vet-profile", 
                            'order' => "ASC", 
                            'orderby' => "menu_order", 
                            'author'=>"$logged_in_user"
                        )
    );
    while ( $loop->have_posts() ): $loop->the_post();
        $current_postID = $post->ID;
        $current_posttitle = get_the_title(); 
    endwhile;   

    // count how many files were uploaded
    $upload_files = $_FILES[ 'upload_files' ];

    // load up a variable with the upload direcotry
    $uploads = wp_upload_dir();

    // foreach file uploaded do the upload
    //foreach ( range( 0, $count_files ) as $i ) 
    //{
        // create an array of the $_FILES for each file
        $file_array = array(
            'name' => $_FILES['upload_files']['name'],
            'type'  => $_FILES['upload_files']['type'],
            'tmp_name'  => $_FILES['upload_files']['tmp_name'],
            'error' => $_FILES['upload_files']['error'],
            'size'  => $_FILES['upload_files']['size'],
        );

        // check to see if the file name is not empty
        if ( !empty( $file_array['name'] ) ) 
        { ?>
     <?php
            // upload the file to the server
            $uploaded_file = wp_handle_upload( $upload_files, $upload_overrides );

            if ( $uploaded_file ) 
            {
                echo '<script>alert("Image successfully uploaded.\n");</script>';
            } 
            else 
            {
                echo '<script>alert("Fish! some error occured. Please try again.");</script>';
            } 

            // checks the file type and stores in in a variable
            $wp_filetype = wp_check_filetype( basename( $uploaded_file['file'] ), null );   

            // set up the array of arguments for "wp_insert_post();"
            $attachment = array(
                'post_mime_type' => $wp_filetype['type'],
                'post_title' => preg_replace('/\.[^.]+$/', '', basename( $uploaded_file['file'] ) ),
                'post_content' => '',    
                'post_author' => $logged_in_user,
                'post_status' => 'inherit',
                'post_type' => 'attachment',
                'post_parent' => $current_postID,
                'guid' => $uploads['url'] . '/' . $file_array['name']
            );


            // insert the attachment post type and get the ID
            $attachment_id = wp_insert_attachment( $attachment, $uploaded_file['file'], $current_postID );

            // generate the attachment metadata
            $attach_data = wp_generate_attachment_metadata( $attachment_id, $uploaded_file['file'] );

            // update the attachment metadata
            wp_update_attachment_metadata( $attachment_id, $attach_data);

            // set thumbnail to the current post
            set_post_thumbnail( $current_postID, $attachment_id );

            echo '<script>alert("set thumbnail")';
            $location = empty($_POST['redirect_to']) ? get_redirect_link() : $_POST['redirect_to'];
            wp_safe_redirect( $location ); 
            echo '<script>alert("End Loop");</script>';
        }

---

提前致谢

Answer 1

我发现我可以可靠地调用wp_redirect 的唯一位置是在init 操作挂钩（http://codex.wordpress.org/Plugin_API/Action_Reference/init）的回调函数中，正如文档中明确指出的那样：

在 WordPress 完成加载之后但在任何标题之前运行 发送。对于拦截 $_GET 或 $_POST 触发器很有用。

您可能想对此进行调查。如果这对您不起作用，您可能想尝试的另一件事是使用输出缓冲。这是一个关于如何做到这一点的简洁教程：

http://tommcfarlin.com/wp_redirect-headers-already-sent/

Answer 2

    echo '<script>alert("set thumbnail")';
    $location = empty($_POST['redirect_to']) ? get_redirect_link() : $_POST['redirect_to'];
    wp_safe_redirect( $location ); 
    echo '<script>alert("End Loop");</script>';

上面的代码肯定行不通。将某些内容写入输出后，您将无法重定向。我没有检查其余的代码，但如果它按你说的那样工作，删除顶行和底行（或者甚至只是顶行）应该可以使它全部工作：

$location = empty($_POST['redirect_to']) ? get_redirect_link() : $_POST['redirect_to'];
wp_safe_redirect( $location );

（如果您在 wp-config.php 中启用调试模式，您应该会看到一条错误消息，而不仅仅是白屏。因此，如果这不起作用，您可以将错误复制到这里，我们可以确切地知道是什么问题是。）