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ALTERNATIVE CODE <?php // Update present values if (isset($_POST['submit'])) { // Get a list of student ids to check $idsResult = mysql_query("SELECT student_id from students"); $presentIds = array(); $absentIds = array(); while($idRow = mysql_fetch_array($idsResult)) { // If the student's checkbox is checked, add it to the presentIds array. if(isset($_POST['present'.$idRow['student_id']])) { …
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