Create a Pagination with PHP

Example of a pager (pagination) on php:

function showpager($currentIndex = 0, $buttons = 5, $totalPages = 50) {

  $currentPage = $lowerLimit = $upperLimit = min($currentIndex, $totalPages);

  //Search boundaries

  for ($b = 0; $b < $buttons && $b < $totalPages;) {

    if ($lowerLimit > 0) {

      $lowerLimit--;

      $b++;

    }

    if ($b < $buttons && $upperLimit < $totalPages) {

      $upperLimit++;

      $b++;

    }

  }

  //Do output to a html element

  for ($i = $lowerLimit; $i < $upperLimit; $i++) {

    if ($i == $currentPage) {

      echo ' [' . $i . '] ';

    }

    else {

      echo ' <a href="#">[<em>' . $i . '</em>]</a> ';

    }

  }

}

For Tests :

for ($i = 0; $i < 51; $i++) {

  echo "<br> $i : ";

  showpager($i);

}