<?php
$h='localhost'; $d='leminera_data'; $u='leminer_app'; $p='apollondestroyer66';
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
try {
  $m = new mysqli($h,$u,$p,$d,3306);
  $m->set_charset('utf8mb4');
  echo "OK: Connected as $u to $d";
} catch (Throwable $e) {
  http_response_code(500);
  echo "ERROR: ".$e->getMessage();
}