PHP (codeigniter) - How to check if the next two rows have value? - php

Question

I wanted to check if the next TWO rows or ID is not NULL.
because if there is no succeeding TWO rows or ID then the income remains zero.
foreach ($data as $row)
{
if(($row->id + 2) != NULL) //I don't know what is the correct statement here
{
echo "<tr>";
echo "<td>".$row->id."</td>";
echo "<td>".$row->username."</td>";
echo "<td>"."650.00"."</td>";
echo "<td>".$row->remarks."</td>";
echo "<tr>";
}
else
{
echo "<tr>";
echo "<td>".$row->id."</td>";
echo "<td>".$row->username."</td>";
echo "<td>".$row->income."</td>";
echo "<td>".$row->remarks."</td>";
echo "<tr>";
}
}
Here is the table I want to achieve.
==================================
|ID | Username | Income | Remarks|
| 2 | user1 | 650.00 | |
| 3 | user2 | 650.00 | |
| 4 | user3 | 0.00 | |
| 5 | user4 | 0.00 | |
==================================
If I add a username then the next output will be this:
==================================
|ID | Username | Income | Remarks|
| 2 | user1 | 650.00 | |
| 3 | user2 | 650.00 | |
| 4 | user3 | 650.00 | |
| 5 | user4 | 0.00 | |
| 6 | user5 | 0.00 | |
==================================

Answer 1

You need to change your foreach to get the index.
foreach ($data as $index => $row)
Then you can address all rows relative to your current row with:
$row_two_ahead = $data[$index + 2];
you should check however if that row exists before you try to use it or you will get index out of range exceptions:
if (isset($data[$index + 2])) {
}

Answer 2

I solved the problem...
this is the code from my controller:
public function addUsername()
{
$data['id'] = NULL;
$data['username'] = $this->input->post('username');
$data['reward'] = 0.00;
$data['remarks'] = ' ';
$this->Matrix_model->addUsername($data);
$last = $this->Matrix_model->getLast();
$index = $last - 2; //I minus the last index with two
$this->Matrix_model->updateIncome($index); //and updated the income of that index
redirect('http://localhost/matrix/index.php/matrix');
}
and this is the code from my model:
public function addUsername($data)
{
$this->db->insert("income", $data);
}
public function getLast()
{
return $this->db->insert_id(); //this is the method to access the last id inserted
}
public function updateIncome($id)
{
$this->db->set("reward", 650);
$this->db->where("id", $id);
$this->db->update("income");
}
thank you and I'm sorry if other programmers didn't understand my questions