Table

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Table</title>
</head>
<body>
    <h1>File info</h1>
    <?php

        "<table>";
        $file = fopen("namesInfo.txt", "r") or die("Unable to open file!");

        $table = "<table border = \"1px\">";
        $table .=   "<thead>";
        $table .=     "<tr>";
        $table .=         "<th>Name</th>";
        $table .=         "<th>Salary</th>";
        $table .=         "<th>Town</th>";
        $table .=         "<th>Age</th>";
        $table .=     "</tr>";
        $table .=   "</thead>";
        $table .= "<tbody>";

        $countName = 0;
        $sumSalary = 0;
        $sumAge = 0;
        $towns = array();
        $index_of_town = 0;

        while(!feof($file)) {
            $currentRow = fgets($file);
            $splitCurrentRow = explode(" ", $currentRow);
            if(count($splitCurrentRow) !=1){
                $name = explode(":",$splitCurrentRow[0])[1];
                $salary = explode(":",$splitCurrentRow[1])[1];
                $town = explode(":",$splitCurrentRow[2])[1];
                $age = explode(":",$splitCurrentRow[3])[1];

                $table .= "<tr>";
                $table .= "<td>" . $name . "</td>";
                $table .= "<td>" . $salary . "</td>";
                $table .= "<td>" . $town . "</td>";
                $table .= "<td>" . $age . "</td>";
                $table .= "</tr>";
                $countName++;
                $sumSalary += $salary;
                $sumAge += $age;
                $index_of_town++;

            }
        }
        $averageAges = round($sumAge / $countName);
        $most_common_town = $towns[0];

        $table .= "</tbody>";
        $table .=   "<tfoot>";
        $table .=      "<tr>";
        $table .=         "<td style=\"color:red\">" . $countName . "</td>";
        $table .=         "<td style=\"color:red\">" . $sumSalary . "</td>";
        $table .=         "<td style=\"color:red\">" .  $towns . "</td>";
        $table .=         "<td style=\"color:red\">" . $averageAges . "</td>";
        $table .=     "</tr>";
        $table .=   "</tfoot>";
        $table .= "</table>";

        echo $table;

    ?>
</body>
</html>