paginator.class.php

<?php

// source: http://net.tutsplus.com/tutorials/php/how-to-paginate-data-with-php/
class Paginator
{
    var $items_per_page;
    var $items_total;
    var $current_page;
    var $num_pages;
    var $mid_range;
    var $low;
    var $high;
    var $limit;
    var $return;
    var $default_ipp = 25;
    var $querystring;

    function Paginator()
    {
        $this->current_page   = 1;
        $this->mid_range      = 7;
        $this->items_per_page = (!empty($_GET['ipp'])) ? $_GET['ipp'] : $this->default_ipp;
    }

    function paginate()
    {
        if ($_GET['ipp'] == 'All') {
            $this->num_pages      = ceil($this->items_total / $this->default_ipp);
            $this->items_per_page = $this->default_ipp;
        } else {
            if (!is_numeric($this->items_per_page) OR $this->items_per_page <= 0)
                $this->items_per_page = $this->default_ipp;
            $this->num_pages = ceil($this->items_total / $this->items_per_page);
        }
        $this->current_page = (int) $_GET['page']; // must be numeric > 0
        if ($this->current_page < 1 Or !is_numeric($this->current_page))
            $this->current_page = 1;
        if ($this->current_page > $this->num_pages)
            $this->current_page = $this->num_pages;
        $prev_page = $this->current_page - 1;
        $next_page = $this->current_page + 1;

        if ($_GET) {
            $args = explode("&", $_SERVER['QUERY_STRING']);
            foreach ($args as $arg) {
                $keyval = explode("=", $arg);
                if ($keyval[0] != "page" And $keyval[0] != "ipp")
                    $this->querystring .= "&" . $arg;
            }
        }

        if ($_POST) {
            foreach ($_POST as $key => $val) {
                if ($key != "page" And $key != "ipp")
                    $this->querystring .= "&$key=$val";
            }
        }

        if ($this->num_pages > 10) {
            $this->return = ($this->current_page != 1 And $this->items_total >= 10) ? "<a class=\"paginate\" href=\"$_SERVER[PHP_SELF]?page=$prev_page&ipp=$this->items_per_page$this->querystring\">&laquo; Previous</a> " : "<span class=\"inactive\" href=\"#\">&laquo; Previous</span> ";

            $this->start_range = $this->current_page - floor($this->mid_range / 2);
            $this->end_range   = $this->current_page + floor($this->mid_range / 2);

            if ($this->start_range <= 0) {
                $this->end_range += abs($this->start_range) + 1;
                $this->start_range = 1;
            }
            if ($this->end_range > $this->num_pages) {
                $this->start_range -= $this->end_range - $this->num_pages;
                $this->end_range = $this->num_pages;
            }
            $this->range = range($this->start_range, $this->end_range);

            for ($i = 1; $i <= $this->num_pages; $i++) {
                if ($this->range[0] > 2 And $i == $this->range[0])
                    $this->return .= " ... ";
                // loop through all pages. if first, last, or in range, display
                if ($i == 1 Or $i == $this->num_pages Or in_array($i, $this->range)) {
                    $this->return .= ($i == $this->current_page And $_GET['page'] != 'All') ? "<a title=\"Go to page $i of $this->num_pages\" class=\"current\" href=\"#\">$i</a> " : "<a class=\"paginate\" title=\"Go to page $i of $this->num_pages\" href=\"$_SERVER[PHP_SELF]?page=$i&ipp=$this->items_per_page$this->querystring\">$i</a> ";
                }
                if ($this->range[$this->mid_range - 1] < $this->num_pages - 1 And $i == $this->range[$this->mid_range - 1])
                    $this->return .= " ... ";
            }
            $this->return .= (($this->current_page != $this->num_pages And $this->items_total >= 10) And ($_GET['page'] != 'All')) ? "<a class=\"paginate\" href=\"$_SERVER[PHP_SELF]?page=$next_page&ipp=$this->items_per_page$this->querystring\">Next &raquo;</a>\n" : "<span class=\"inactive\" href=\"#\">&raquo; Next</span>\n";
            $this->return .= ($_GET['page'] == 'All') ? "<a class=\"current\" style=\"margin-left:10px\" href=\"#\">All</a> \n" : "<a class=\"paginate\" style=\"margin-left:10px\" href=\"$_SERVER[PHP_SELF]?page=1&ipp=All$this->querystring\">All</a> \n";
        } else {
            for ($i = 1; $i <= $this->num_pages; $i++) {
                $this->return .= ($i == $this->current_page) ? "<a class=\"current\" href=\"#\">$i</a> " : "<a class=\"paginate\" href=\"$_SERVER[PHP_SELF]?page=$i&ipp=$this->items_per_page$this->querystring\">$i</a> ";
            }
            $this->return .= "<a class=\"paginate\" href=\"$_SERVER[PHP_SELF]?page=1&ipp=All$this->querystring\">All</a> \n";
        }
        $this->low   = ($this->current_page - 1) * $this->items_per_page;
        $this->high  = ($_GET['ipp'] == 'All') ? $this->items_total : ($this->current_page * $this->items_per_page) - 1;
        $this->limit = ($_GET['ipp'] == 'All') ? "" : " LIMIT $this->low,$this->items_per_page";
    }

    function display_items_per_page()
    {
        $items     = '';
        $ipp_array = array(
            10,
            25,
            50,
            100,
            'All'
        );
        foreach ($ipp_array as $ipp_opt)
            $items .= ($ipp_opt == $this->items_per_page) ? "<option selected value=\"$ipp_opt\">$ipp_opt</option>\n" : "<option value=\"$ipp_opt\">$ipp_opt</option>\n";
        return "<span class=\"paginate\">Items per page:</span><select class=\"paginate\" onchange=\"window.location='$_SERVER[PHP_SELF]?page=1&ipp='+this[this.selectedIndex].value+'$this->querystring';return false\">$items</select>\n";
    }

    function display_jump_menu()
    {
        for ($i = 1; $i <= $this->num_pages; $i++) {
            $option .= ($i == $this->current_page) ? "<option value=\"$i\" selected>$i</option>\n" : "<option value=\"$i\">$i</option>\n";
        }
        return "<span class=\"paginate\">Page:</span><select class=\"paginate\" onchange=\"window.location='$_SERVER[PHP_SELF]?page='+this[this.selectedIndex].value+'&ipp=$this->items_per_page$this->querystring';return false\">$option</select>\n";
    }

    function display_pages()
    {
        return $this->return;
    }
}
?>