$header = null;
$pcs = array();
if (($handle = fopen($filename, 'rb')) !== false) { // opening using rb is binary safe, not necessary just safer in this multi-byte emoji world
    while (($row = fgetcsv($handle)) !== false ) { // don't need to define the length of delimiter if you're just on the defaults
        // just a quick way to skip over the header row
        if (is_null($header)) {
            $header = $row;
            continue; // continue will skip the rest of the logic in this loop iteration, but not break out of the loop
        }
        list($ip, $side, $pos) = $row; // get the first three values from the $row array and assign them to variables
//	print_r($row);
//	$ip = $row[0];
//	$side = $row[1];
//	$pos = $row[2];
        if (empty($side)) { // empty checks for null, 0 or empty string values
            continue;
        }

	$pcs[$ip] = $ip; // and then assign them into an associative array, using the array key as the code and the value as the name
	$pcs[$pos] = $pos; // and then assign them into an associative array, using the array key as the code and the value as the name
	$pcs[$side] = $side;

	print_r($pcs);
    }

    fclose($handle);
}

<table
 style="width: 40%; text-align: left; margin-left: auto; margin-right: auto;"
 border="0" cellpadding="2" cellspacing="2" class="inlineTable">
    <tbody>
        <tr>
		<td style="text-align: center;"><strong style="font-size: 40px; font-family:verdana;"><font color="#0000FF">REBOOT</font></td>
		<td style="text-align: center;"><strong style="font-size: 40px; font-family:verdana;"><font color="#0000FF">ABORT</font></td>
		<?= $row ?>

        </tr>

        <!-- iterate over the $teams array, in each loop assign the current element to the $team variable -->
        <?php foreach ($pcs as $ip=>$side): ?>
            <tr>
                <td style="text-align: center;">                    <!-- without using js, you'll need to have a separate form for each button, so only one $_POST variable is sent per button press -->
                    <form method="POST">
                        <!-- use a hidden form element to pass the team code across, using the same $_POST value -->
                        <input type="hidden" name="pc" value="<?= $ip ?> -r" />
                        <button type="submit" style="height:60px;width:250px;background-color:red">
                            <b>***** REBOOT *****<br> <?= $ip ?> <br> Position: <?= $side ?> </b></style>
                        </button>
                    </form>
                </td>
                <td style="text-align: center;">
                    <form method="POST">
                        <input type="hidden" name="pc" value="<?= $ip ?> -a" />
                        <button type="submit" style="height:60px;width:250px;background-color:green">
                            <b>ABORT REBOOT<br> <?= $ip ?> <br> Position: <?= $side ?> </b></style>
                        </button>
                    </form>
		</td>
            </tr>
        <?php endforeach; ?>

    </tbody>
</table>