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1. drupal
   1. drupal6
   2. drupal7

Do one pass of execution and inform back the browser about progression (used for JavaScript-mode only).

Code

includes/batch.inc, line 97

<?php
function _batch_do() {
  // HTTP POST required
  if ($_SERVER['REQUEST_METHOD'] != 'POST') {
    drupal_set_message(t('HTTP POST is required.'), 'error');
    drupal_set_title(t('Error'));
    return '';
  }

  // Perform actual processing.
  list($percentage, $message) = _batch_process();

  drupal_json(array('status' => TRUE, 'percentage' => $percentage, 'message' => $message));
}
?>