streams/include/sharedwithme.php

<?php

function apply_updates()
{

    //check for updated items and remove them
    $x = q(
        "SELECT mid, max(obj) AS obj FROM item WHERE verb = '%s' AND obj_type = '%s' GROUP BY mid",
        dbesc(ACTIVITY_UPDATE),
        dbesc(ACTIVITY_OBJ_FILE)
    );

    if ($x) {
        foreach ($x as $xx) {
            $object = json_decode($xx['obj'], true);

            $d_mid = $object['d_mid'];
            $u_mid = $xx['mid'];

            $y = q(
                "DELETE FROM item WHERE obj_type = '%s' AND (verb = '%s' AND mid = '%s') OR (verb = '%s' AND mid = '%s')",
                dbesc(ACTIVITY_OBJ_FILE),
                dbesc(ACTIVITY_POST),
                dbesc($d_mid),
                dbesc(ACTIVITY_UPDATE),
                dbesc($u_mid)
            );
        }
    }
}