How to get option values set from all sites within a Multisite setup?

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I created a plugin that is used on every site within my Multisite setup. Within this plugin I have an admin setting page that allows each site to set the options according to the sites needs. Each site saves its data with the add_option() function.

How do I query all the custom options values from all the sites on the Multisite? I need to collect the values and then store them into an array. Once in an array I will be using it to check another value with the array to see if it exist within the array of option values from all the sites.

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How to find all the values of the custom options?

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3 comments

  1. You can use get_site_option() function to get single network-wide option.

    Example :

    $singleoption = get_site_option( 'siteurl' );

    If you want to get all options from all sites use wp_load_alloptions() function.

    Example :

    $alloptions = wp_load_alloptions()

  2. So this is what I came up with and it works, but if there is a more efficient way of getting the same results (like a built in WP function) then please let me know. Thanks.

     global $wpdb;

        $blogs = $wpdb->get_results("SELECT blog_id FROM wp_blogs where blog_id > 1");

        foreach ($blogs as $blog) {

            $option_values = $wpdb->get_results("SELECT option_value FROM wp_" . $blog->blog_id . "_options WHERE option_name='mb-activation-options' ");

            foreach ($option_values as $value) {
                var_dump($value->option_value);
            }
        }

  3. Thanks for the response, but wp_load_alloptions() is only returning all options and values from a the single site that it is loaded on and not all the options and values from all the sites on the network.

    What I need is something like below where I copied from wp_load_alloptions() core and added the WHERE clause. However this returns only the site option specific to where it is executed, because the $wpdb prefix calls for the site that is ran.

    $alloptions_db = $wpdb->get_results("SELECT option_name, option_value FROM $wpdb->options WHERE option_name = 'NAME_OF_OPTION'");

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