<?php
echo "<table border=1 width=300>";
for($count =1; $count<11; $count++){
foreach ($_POST['seat'] as $selected) {
    if($selected == $count ){
    echo "<td><span style='display: inline-block;
             background-color: red'>A$count</span></td> ";
}
else {
    echo "<td>A$count</td>";
}
}
}

echo "</table>";
echo "<table border=1 width=300>";
for($count =1; $count<10; $count++){
    echo "<td>B$count</td>";
}
echo "<td>B10    </td>";
echo "</table><br/>";

?>