disable-self-pings-on-multisite.code-snippets.xml

<?xml version="1.0" encoding="UTF-8"?>
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<snippets>
  <snippet scope="1">
    <name>Disable self pings on multisite</name>
    <desc></desc>
    <tags>pingbacks, pings, multisite, wordpress</tags>
    <code>function multisite_no_self_ping( &amp;$links ) {&#13;
    $sites     = get_sites();&#13;
    $site_urls = array();&#13;
    foreach ( $sites as $site ) {&#13;
        $site_urls[] = get_home_url( $site-&gt;blog_id );&#13;
    }&#13;
    foreach ( $links as $key =&gt; $link ) {&#13;
        foreach ( $site_urls as $site_url ) {&#13;
            if ( 0 === strpos( $link, $site_url ) ) {&#13;
                unset( $links[ $key ] );&#13;
            }&#13;
        }&#13;
    }&#13;
}&#13;
add_action( 'pre_ping', 'multisite_no_self_ping' );&#13;
</code>
  </snippet>
</snippets>