php - Displayind data in a codeigniter view using a table -

hi having problem in sorting correct <td> display subject results students. have 11 subjects offered in school , senior students take 8 subjects because 4 electives @ level. when fetching results senior students , displaying when student not take subject still echoes result in wrong field.my code below not distinguish e.g if <td> physics or biology. 

i want echo (-) student not take subject.thanks in advance

<table border='1'>         <tr><th>position</th><th>students</th><th>english</th><th>kiswahili</th><th>maths</th><th>biology</th><th>physics</th><th>chemistry</th><th>history</th><th>geography</th><th>cre</th><th>agriculture</th><th>business</th><th>total marks</th><th>mean grade</th><th>aggregate points</th><th>action</th>         </tr>          <?php //loop display names of students         $i = 1;         foreach ($overallresults $result) {             echo "<tr>";             echo "<td>";                         echo $i++;         echo "</td>";         $admno = $result->admno;         $total_marks = $result->total_marks;         $agp = $result->aggregate_points;         $mean_grade = $result->mean_grade;         $agp = $result->aggregate_points;         $result_id = $result->result_id;         $fname = "";          foreach ($students $student) {             // print_r($student);             $admno1 = $student->admno;             if ($admno == $admno1) {                 // print_r($student);                 $fname = $student->firstname;                 $mname = $student->middlename;                 $lname = $student->lastname;                 //}                 // }                 //echo "<tr>";                  echo "<td>";                 echo $fname . " " . $mname . " " . $lname;                 echo "</td>";             }         }             foreach ($subjectresults $subresult) {             // print_r($result);              $score = "0";             $admno3 = $subresult->admno;             $subcode = $subresult->subcode;             $score = $subresult->score;              if ($admno == $admno3) {                 if ($subcode == '232') {                     $score = $score;                 }                 if ($subcode == '101') {                     echo "<td>";                     echo $score;                     echo "</td>";                 }                   if ($subcode == '102') {                     echo "<td>";                     echo $score;                     echo "</td>";                 }                 if ($subcode == '121') {                     echo "<td>";                     echo $score;                     echo "</td>";                 }                 if ($subcode == '231') {                     echo "<td>";                     echo $score;                     echo "</td>";                 }                 if ($subcode == '232') {                     echo "<td>";                     echo $score;                     echo "</td>";                 }                  if ($subcode == '233') {                     echo "<td>";                     echo $score;                     echo "</td>";                 }                 if ($subcode == '311') {                     echo "<td>";                     echo $score;                     echo "</td>";                 }                 if ($subcode == '312') {                     echo "<td>";                     echo $score;                     echo "</td>";                 }                 if ($subcode == '313') {                     echo "<td>";                     echo $score;                     echo "</td>";                 }                 if ($subcode == '443') {                     echo "<td>";                     if (!$score) {                         echo 0;                     } else {                         echo $score;                     }                     echo "</td>";                 }                 if ($subcode == '565') {                     echo "<td>";                     echo $score;                     echo "</td>";                 }             }         }             ?>           <?php         if (isset($term)) {             $term = $term;         }         if (isset($form)) {             $form = $form;         }          if (isset($year)) {             $year = $year;         }         if (isset($examcategory)) {             $examcategory = $examcategory;         }          //if ($admno == $admno1) {         // print_r($student);         //}         // }          echo "<td>";         echo $total_marks;         echo "</td>";         echo "<td>";         echo $mean_grade;         echo "</td>";         echo "<td>";         echo $agp;         echo "</td>";         echo "<td>";          echo "</td>";          //}     }     ?>      </table>     <?php } ?> </div> 

the above code works displays subject done students in wrong table data field.the subjects identified using subject codes english 101 while kiswahili 102,maths 121

i can see subjects static. rather have data structure results, proper relation's based on student id, course id. can loop results , fetch relevant subjects names , student names. eg;

<?php $results = array(); $subjects = array(101=>"english", 102=>"kiswahili",103=>"physics",104=>"chemistry"); $students = array("tom","dick","ally"); $result1 = array( 'studentid'=>1, 'score'=>array(       101=>20,       102=>30,       103=>30,       104=>45 ),);  $result2 = array( 'studentid'=>2, 'score'=>array(       101=>34,       102=>54,       103=>77 ),); $results[] = $result1; $results[] = $result2; echo "<table border='1'>"; echo "<tr>"; echo "<th>#</th><th>student</th>"; for($i = 101; $i < 105; $i++){ echo "<th>".$subjects[$i]."</th>"; } echo "</tr>"; $count = 1; foreach($results $result){  echo "<tr>"; echo "<td>".$count."</td>"; echo "<td>".$students[$result['studentid']]."</td>"; foreach($subjects $key => $value){ $marks = $result['score'][$key]!=null?$result['score'][$key]:'-'; echo "<td>".$marks."</td>"; } echo "</tr>"; $count++; } echo "</table>"; ?> 

ofcourse have write helper functions fetching student names , calculating mean scores.