function createMachineSumRow($category_id)
{
    $row = "<tr><td class='overviewNoWrapRight'>(Machine Totals)</td>";
    $machineArray = getArrayOfMachines();
    $total = 0;
    foreach ($machineArray as $machineInfo) {
        $district = $machineInfo[0];
        $machine = $machineInfo[1];
        $name = getDistrictName($district);
        $machine_total = getMachineTotal($category_id, $district, $machine);
        $total += $machine_total;
        $row .= "<td  class='overview'>";
        $row .= $machine_total;
        $row .= "</td>";
    }
    $row .= "<td class='overview'>{$total}</td></tr>";
    return $row;
}
function createDistrictMachineHeader($categoryName)
{
    $header = "<tr><th  class='overview'>{$categoryName}</th>";
    $machineArray = getArrayOfMachines();
    foreach ($machineArray as $machineInfo) {
        $district = $machineInfo[0];
        $machine = $machineInfo[1];
        $header .= "<th  class='overview'>";
        $header .= "D{$district}  M{$machine}";
        $header .= "</th>";
    }
    $header .= "</tr>";
    return $header;
}
<html>
 <head>
  <title>Election</title>
 <link rel="stylesheet" type="text/css" href="./elections.css" />
 <script src="elections.js"></script>
 </head>
 <body style="text-align: center; background-color: #F3E2A9">
  <table><tr><td id="main">
 <div class="sidebar">
  <br>
  <h2>Choose Districts and Machines:</h2>
  
<?php 
include "SaveElection.php";
connect();
$machineArray = getArrayOfMachines();
foreach ($machineArray as $machineInfo) {
    $d = $machineInfo[0];
    $m = $machineInfo[1];
    $districtMachineString = "{$d}.{$m}";
    echo "<button class='link' onclick='showInfo({$districtMachineString})'>";
    if (dataEntered($d, $m) == true) {
        echo "<div class='highlight'>";
    } else {
        echo "<div class='lowlight'>";
    }
    echo "District {$d}, Machine {$m}</div></button>";
}
?>
  <hr>
  <button class='link' onclick='showSpreadsheet()'>Spreadsheet Overview</button>