Optimising a php script

I'm looking for some assistance with a php script I'm writing. It creates a table that is then exported to an excel file for download, the issues as I see them are as follows:

$students contains 559 items and the $classes has 22 items and $attributes has 6 items

<tbody>
    <?php foreach($students as $student){
    $pupil = Students::retrieveByPK($student['adno']); ?>
<tr>
    <td><?php echo strtoupper($pupil->surname); ?></td>
    <td><?php echo $pupil->first_name; ?></td>
    <td><?php echo $pupil->year_group; ?></td>
    <?php foreach($classes as $class){
        $shortYear = str_replace('Year ', '',$pupil->year_group);
        $slashPos = strpos($class['class_name'],'/');
        $className = $shortYear.substr($class['class_name'],1);
        $classId = Classes::idFromClassName($className); 
        foreach($attributes as $attribute){
           $attr = AttributeResults::getExportAttribute($pupil->adno, $classId, $attribute['attribute_id']); ?>
        <td align="center"><?php echo $attr[0]['attribute_value']; ?></td>
        <?php } ?>
     <?php } ?>
</tr>
    <?php } ?>
</tbody>

I'm essentially running the AttributeResults::getExportAttribute method in the region of 74000 times and wondered if there was a better way of bringing this data back?

Any assistance would be greatly appreciated.