CREATE TABLE IF NOT EXISTS jss1_prelim (
id int(11) NOT NULL AUTO_INCREMENT,
term varchar(30) NOT NULL,
idnumber varchar(30) NOT NULL,
subject varchar(30) NOT NULL,
score varchar(30) NOT NULL,
teacher varchar(30) NOT NULL,
PRIMARY KEY (id)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=6 ;

INSERT INTO `jss1_prelim` (`id`, `term`, `idnumber`, `subject`, `score`, `teacher`)
VALUES
(1, 'Prelim', 'SBI-JS202', 'Computer', '82', 'TID273'),
(2, 'Prelim', 'SBI-JS645', 'Computer', '63', 'TID273'),
(3, 'Prelim', 'SBI-JS300', 'Computer', '65', 'TID273'),
(4, 'Prelim', 'SBI-JS202', 'Igbo', '70', 'TID015'),
(5, 'Prelim', 'SBI-JS645', 'Igbo', '65', 'TID015');

我需要有关此脚本的帮助，该脚本可以很好地对sql数据库条目进行排序。但是我需要php代码来根据其得分（第一，第二，第三，第三，第五）给出位置。

<table border = '2'>
<tr>
<td>Student ID</td>
<td>Score</td>
<td>Position</td>
</tr>
<?php

$con = mysql_connect("localhost", "root", "");
if(!$con)
{
    echo "Could not establish connection to the database " . mysql_error();
}

$mydb = mysql_select_db("sbicenugu", $con);
if (!$mydb)
{
    echo "Error selecting database " . mysql_error();
}

$mystatement = mysql_query("SELECT * FROM jss1_prelim ORDER BY score DESC");
$dbcount = mysql_num_rows($mystatement);
$selection = array(0 => "");
$nameselection = array(0 => "");

$i = 0; 
    while ($row = mysql_fetch_array($mystatement))
    {
    $selection[$i] = $row['score'];
    $nameselection[$i] = $row['idnumber'];
    $i++; 
    }
arsort($selection);
ksort($nameselection);

for ($x = 0; $x < $dbcount; $x++)
{
echo "<tr> <td>$nameselection[$x]</td> 
<td>$selection[$x]</td>
<td>"; $grades = array($selection[$x]);
$occurrences = array_count_values($grades);
$grades = array_unique($grades);
foreach($grades as $grade) 
{
if($grade == end($grades))$i += $occurrences[$grade]-1;
echo str_repeat('-'.($i + 1).'<br>',$occurrences[$grade]);
$i+= $occurrences[$grade];
}
echo"</td> 
</tr>"; 
}
?>
</table>

这个剧本没有给我我对学生在课堂上的地位的期望。对于那些得分一样的人，它也给出了不同的价值位置。为此，我需要帮助。