背景：
我两次都试过了https://wordpress.org/plugins/bainternet-posts-creation-limits 和https://wordpress.org/plugins/limit-posts/, 但由于某种原因，它们在我的自定义帖子中不起作用。所以我决定编写自己的php脚本，并将其放入子主题的函数中。php，以限制特定用户可以创建的特定自定义帖子类型的数量。

结构：
我正在使用安装在bluehost上的wordpress 5.4.2。我正在使用GeodDirectory创建自定义帖子类型（从业者和组织），并使用memberpress管理权限
我决定过滤wp\\u post\\u数据，因为我只想在第一次创建帖子时更改帖子的状态，这取决于作者已经创建了多少篇帖子。一些人建议wp\\U insert\\U post\\U empty\\U内容，但我认为一个更好的用例是允许他们先将实际帖子创建为草稿，然后要求他们获得适当的成员资格来发布它。

限制条件：
因为我网站上的另一个插件只给特定角色授予权限，所以我给每个非管理员的人都赋予了该特定用户角色，因此无法按用户角色限制发布权限。这就是为什么我使用memberpress成员资格来管理发布能力。

Issue/What is wrong:
运行代码后：
1-所有用户，而不仅仅是成员资格不足的非管理员，都无法保存新的CPT。即使管理员也无法保存CPT
2-用户单击“提交”时会收到此消息：“提交”；您没有执行此操作的权限"E；我写了一条不同的消息，给这个操作的错误成员身份的用户。

方法：

<?php
//Before a newly created post is saved to the database, filter by membership
add_filter(\'wp_insert_post_data\', \'tml_filter_by_membership\', 99, 2);
/**
 99 refers to the priority when this filter is executed; 99 indicates that it is one of the last filters executed on this action
 2 indicates that we want both arguments given by the filter (because the second one contains sanitized but unmodified data--which is the data we want). Without 2, the function defaults to 1, giving us only slashed post data
 *
 */

//filter by membership only acts on non-admin posts of certain post types
function tml_filter_by_membership($data, $postarr)
{

    //take only non-admin posts
    if (!user_can($postarr[\'post_author\'], \'manage_options\'))
    {

        // continue only if the post type is gd_practitioner or gd_studio
        if ($postarr[\'post_type\'] == \'gd_practitioner\' || $postarr[\'post_type\'] == \'gd_organization\')
        {

            //Set membership post limits by post_type
            $membership_post_limits = tml_set_membership_post_limits_by_post_type();

            //Get author\'s membership
            $author_memberships = tml_get_post_author_memberships($postarr);

            //Look up the author\'s post limit for that post type within the membership post limits array
            $author_post_limit = tml_get_author_post_limit($author_memberships, $membership_post_limits, $postarr);

            //Count author\'s published posts of the particular post type
            $number_of_published_posts_by_author = tml_get_author_published_posts($postarr);

            //Compare number of published posts to author\'s post limit and return $postarr
            tml_compare_posts_to_limit($author_post_limit, $number_of_published_posts_by_author, $postarr);
        }
    }
}

//set membership post limits by post_type
function tml_set_membership_post_limits_by_post_type()
{
    $membership_post_limits = Array(
        462 => Array(
            \'gd_practitioner\' => 1,
            \'gd_organization\' => 1
        ) ,
        463 => Array(
            \'gd_practitioner\' => 1,
            \'gd_organization\' => 1
        ) ,
        464 => Array(
            \'gd_practitioner\' => 1,
            \'gd_organization\' => 1
        ) ,
        465 => Array(
            \'gd_practitioner\' => 10,
            \'gd_organization\' => 10
        ) ,
        466 => Array(
            \'gd_practitioner\' => 1,
            \'gd_organization\' => 1
        ) ,
        467 => Array(
            \'gd_practitioner\' => 10,
            \'gd_organization\' => 10
        ) ,
        752 => Array(
            \'gd_practitioner\' => 1,
            \'gd_organization\' => 1
        ) ,
        753 => Array(
            \'gd_practitioner\' => 1,
            \'gd_organization\' => 1
        ) ,
        754 => Array(
            \'gd_practitioner\' => 1,
            \'gd_organization\' => 1
        )
    );
    return $membership_post_limits;
}

//Get author\'s membership
function tml_get_post_author_memberships($postarr)
{
    if (class_exists(\'MeprUser\'))
    {
        $user_id = $postarr[\'post_author\'];
        $user = new MeprUser($user_id);
        $get_memberships = $user->active_product_subscriptions();
        $author_memberships = array_values(array_unique($get_memberships));
        return $author_memberships;
    }
    else
    {
        return false;
    }
}

//Look up the author\'s post limit for that post type within the membership post limits array, using $postarr to give the post type, and $user_memberships to give the author\'s memberships
function tml_get_author_post_limit($author_memberships, $membership_post_limits, $postarr)
{
    $author_post_limit = 1;
    foreach ($author_memberships as $membership)
    {
        if ($author_post_limit < $membership_post_limits[$membership][$postarr[\'post_type\']])
        {
            $author_post_limit = $membership_post_limits[$membership][$postarr[\'post_type\']];
        }
    }
    return $author_post_limit;
}

//Count author\'s published posts of the particular post type
function tml_get_author_published_posts($postarr)
{
    $posts = get_posts(array(
        \'author\' => $postarr[\'post_author\'],
        \'post_type \' => $postarr[\'post_type\'],
        \'numberposts \' => - 1,
        \'post_status \' => \'publish\'
    ));
    $number_of_published_posts_by_author = count($posts);
    return $number_of_published_posts_by_author;
}

/**
 //Another option, using count_user_posts function instead
 function tml_get_author_published_posts($postarr){
 $author= $postarr[\'post_author\'];
 $post_type = $postarr[\'post_type\'];
 $number_of_published_posts_by_author=count_user_posts($author, $post_type);
 return $number_of_published_posts_by_author;
 }
 *
 */

//Compare number of published posts to author\'s post limit
function tml_compare_posts_to_limit($author_post_limit, $number_of_published_posts_by_author, $postarr)
{
    $message = "";
    if ($number_of_published_posts_by_author >= $author_post_limit)
    {
        $postarr[\'post_status\'] = \'draft\';
        $message = "You have exceeded the number of listings for your membership";
    }
    echo "<div> ${message} </div>";
    return $postarr;
}