fix registration enrollment of students

app/Views/parent/register_student.php

@@ -100,14 +100,22 @@ $disableEmergencyBtn = count($emergencies) >= $maxEmergency;
         </div>
     <?php endif; ?>
     <?php
-    // Check if at least one student is not enrolled
     $hasUnenrolled = false;
+    $unenrolledStudentIds = [];
     foreach ($existingKids as $kid) {
         if ($kid['enrollment'] == 0) {
             $hasUnenrolled = true;
-            break;
+            $studentId = (int) ($kid['id'] ?? 0);
+            if ($studentId > 0) {
+                $unenrolledStudentIds[] = $studentId;
+            }
         }
     }
+    usort($unenrolledStudentIds, static fn (int $a, int $b): int => $b <=> $a);
+    $enrollmentUrl = base_url('/parent/enroll_classes?' . http_build_query([
+        'start' => 2,
+        'students' => implode(',', $unenrolledStudentIds),
+    ]));
     ?>
 
     <?php if ($hasUnenrolled): ?>
@@ -118,7 +126,7 @@ $disableEmergencyBtn = count($emergencies) >= $maxEmergency;
             <p class="mb-3">
                 Please complete their enrollment using the button below to ensure they are able to attend classes.
             </p>
-            <a href="<?= base_url('/parent/enroll_classes') ?>"
+            <a href="<?= esc($enrollmentUrl) ?>"
                 class="btn btn-lg btn-success bi bi-pencil-square"
                 data-bs-toggle="tooltip"
                 data-bs-placement="bottom"