Callback

It's possible to put a PHP file in the directory '_callbacks' that is called back at the processing of a pad tag.
- With option 'before' the callback happens for every occurrence before the processing of the ocurrences.
- Without 'before' the callback happens during the processing of the occurrences, as each one is processed.

<?php

  switch ($padCallback) {

    case 'init':

        $salaryTotal = 0;
        $bonusTotal  = 0;

        break;

    case 'row':

        $row ['total'] = $row ['salary'] + $row ['bonus'];

        $salaryTotal += $row ['salary'];
        $bonusTotal  += $row ['bonus'];

        break;

    case 'exit':

        $totalTotal = $salaryTotal + $bonusTotal ;

        break;

  }

?>

<table border=1>

  <tr>
    <th>Name</th>
    <th>Salary</th>
    <th>Bonus</th>
    <th>Total</th>
  </tr>
  
  {staff callback='before.php', before}

    {first}
      <tr>
        <td>Totals</td>
        <td>{$salaryTotal | %.2f}</td>
        <td>{$bonusTotal | %.2f}</td>
        <td>{$totalTotal | %.2f}</td>
      </tr>
    {/first}

    <tr align="right" bgcolor="{switch 'yellow', 'pink'}">
      <td align="left">{$name | capitalize}</td>
      <td>{$salary | %.2f}</td>
      <td>{$bonus | %.2f}</td>
      <td>{$total | %.2f}</td>
    </tr>

  {/staff}
 
</table>

<?php

  switch ($padCallback) {

    case 'init':

        $salaryTotal = 0;
        $bonusTotal  = 0;

        break;

    case 'row':

        $total = $salary + $bonus;

        $salaryTotal += $salary;
        $bonusTotal  += $bonus;

        break;

    case 'exit':

        $totalTotal = $salaryTotal + $bonusTotal ;

        break;

  }

?>

<table border=1>

  <tr>
    <th>Name</th>
    <th>Salary</th>
    <th>Bonus</th>
    <th>Total</th>
  </tr>
  
  {staff callback='demand.php'}

    <tr align="right" 
        bgcolor="{switch 'yellow', 'pink'}">
      <td align="left">{$name | capitalize}</td>
      <td>{$salary | %.2f}</td>
      <td>{$bonus | %.2f}</td>
      <td>{$total | %.2f}</td>
    </tr>

  {/staff}

  <tr>
    <td>Totals</td>
    <td>{$salaryTotal | %.2f}</td>
    <td>{$bonusTotal | %.2f}</td>
    <td>{$totalTotal | %.2f}</td>
  </tr>
 
</table>