Function and usage of privacy_ping_filter() in wordpress


Answers ( 1 )


    The privacy_ping_filter() function in WordPress serves a specific purpose related to maintaining the privacy of a blog. This function is a part of WordPress's core code, which deals with handling pingbacks and trackbacks to other sites. Here's a detailed explanation of its function and usage:


    • Name: privacy_ping_filter()
    • Purpose: To check whether a blog is public before returning sites for pingbacks or trackbacks.
    • How it Works:
      • When a blog post includes links to other websites, WordPress can send pingbacks or trackbacks to these sites. This is a way of notifying them that they have been linked to.
      • However, if a blog is set to be private (i.e., it's not visible to the public), it shouldn't be sending out these notifications.
      • privacy_ping_filter() checks the privacy settings of the blog. If the blog is public, it proceeds with the pingback/trackback. If the blog is private, it prevents these notifications from being sent.


    • $sites (mixed - required):
      • This parameter represents the URLs/sites to which pingbacks or trackbacks would be sent.
      • It is a required parameter and can be a string (single URL) or an array of strings (multiple URLs).


    • Type: mixed
    • Values:
      • Returns an empty string if the blog is not public. This effectively stops the pingback or trackback process as there are no sites to send them to.
      • Returns $sites as it is, if the blog is public. This means the pingbacks or trackbacks will be sent to the specified sites.

    Sample Usage:

    Suppose you are working with a function that prepares a list of sites for pingbacks. You can use privacy_ping_filter() to ensure that these pingbacks are only sent if the blog is public.

    function prepare_ping_sites() {
        $sites = ['', '']; // List of sites for pingbacks
        $sites = privacy_ping_filter($sites); // Filter based on blog's privacy setting
        if (!empty($sites)) {
            // Proceed with sending pingbacks
        } else {
            // Blog is private, don't send pingbacks

    In this example, the prepare_ping_sites() function first defines a list of sites for pingbacks. It then uses privacy_ping_filter() to filter this list based on the blog's privacy settings. If the blog is private, $sites becomes an empty string, and the function doesn't proceed with the pingbacks. If the blog is public, it continues as normal.

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