https://www.gridphp.com/support/questions/redirect-after-insert-with-inserted-id/

sample.php

$e["on_after_insert"] = array("after_insert", null, true);
$g->set_events($e);

function after_insert($data)
{
    // where client_id is primary key (first column of grid)
    $id = $data["client_id"];
    phpgrid_msg("<script>location.href='$id';</script>")
}