random code php

<?php
$sql_pendingReg = $dm->conn->query("SELECT * FROM ".TREKKER." WHERE trek_status = 'Pending' AND reg_status = 'Complete' ORDER BY id DESC");
while ($fth_pendingReg = $sql_pendingReg->fetch_array()) {
    $pTid = $fth_pendingReg['id'];
    $pt_firstname = $fth_pendingReg['first_name'];
    $pt_familyname = $fth_pendingReg['family_name'];
    $pt_bleDeviceId = ($fth_pendingReg['ble_device_id']);
    $pt_contactNo = $fth_pendingReg['contact_no'];
    $pt_email = $fth_pendingReg['email'];
    $sql_lastCheckpointInfo = $dm->conn->query("SELECT * FROM ".TREK_DETAILS." INNER JOIN ".CHECKPOINT."
                            ON ".TREK_DETAILS.".checkpoint_id = ".CHECKPOINT.".id WHERE ".TREK_DETAILS.".trekker_id = '$pTid' AND ".TREK_DETAILS.".device_id = '$pt_bleDeviceId' AND ".TREK_DETAILS.".check_in = 1 ORDER BY ".TREK_DETAILS.".id DESC LIMIT 1");

    $fth_lastCheckpointInfo = $sql_lastCheckpointInfo->fetch_array();
    $lastCheckpointName = $fth_lastCheckpointInfo['name'] ?? '-';



    ?>