<?php
$weldLogs = db("weld_logs")
    ->select(
        "id", 
        "test_package_no", 
        "updated_at"
    )
    ->whereNotNull("test_package_no")
    ->groupBy("test_package_no")
    ->orderBy("updated_at", "DESC")->get();

echo json_encode_tr($weldLogs);