PHP-Formatting table header - php

Question

This code reads a CSV file for creating a table. It works fine.
How do I make the 1st row to be formatted in header style (from the table CSS)?
<table id="myTable" class="tablesorter animated fadeInDown"> <!-- cellspacing='0' is important, must stay -->
<tbody>
<?php
$lines = file('graphdata/IndicForTableVsOthers.csv');
foreach ($lines as $lineNum => $line) {
if($lineNum == 0) {
print " <tr id=\"tr" . $lineNum . "\">";
}
print " <tr id=\"tr" . $lineNum . "\">";
$tokens = str_getcsv($line);
print "<td style=\"width: 300px;\">" . trim($tokens[0]) . "</td>";
print "<td style=\"width: 100px;\">" . trim($tokens[1]) . "</td>";
print "<td style=\"width: 100px;\">" . trim($tokens[2]) . "</td>";
print "<td style=\"width: 100px;\">" . trim($tokens[3]) . "</td>";
print "<td style=\"width: 100px;\">" . trim($tokens[4]) . "</td>";
print "</script>\n";
}
?>
</tbody>

Answer 1

This should work, I also changed some other parts who I think would have generated wrong marup.
<table id="myTable" class="tablesorter animated fadeInDown">
<?php
$lines = file('graphdata/IndicForTableVsOthers.csv');
foreach ($lines as $lineNum => $line) {
$cellType = ($lineNum == 0 ? "th" : "td");
$tokens = str_getcsv($line);
if ($lineNum == 0) echo "<thead>";
if ($lineNum == 1) echo "<tbody>";
echo "<tr id=\"tr" . $lineNum . "\">";
echo "<" . $cellType . " style=\"width: 300px;\">" . trim($tokens[0]) . "</" . $cellType . ">";
echo "<" . $cellType . " style=\"width: 100px;\">" . trim($tokens[1]) . "</" . $cellType . ">";
echo "<" . $cellType . " style=\"width: 100px;\">" . trim($tokens[2]) . "</" . $cellType . ">";
echo "<" . $cellType . " style=\"width: 100px;\">" . trim($tokens[3]) . "</" . $cellType . ">";
echo "<" . $cellType . " style=\"width: 100px;\">" . trim($tokens[4]) . "</" . $cellType . ">";
echo "</tr>";
if ($lineNum == 0) echo "</thead>";
}
if (count($lines) > 1) echo "</tbody>";
?>
</table>

Answer 2

If the first row is printed but it looks light and you want it Bold and Pretty so the user knows it's the header, add a class for convenience.
table.cs-contents tr:first-child td {
font-weight: bold;
text-align: center;
border-bottom: 2px solid #eaeaea;
}