File: Pager.php

<?php
class Pager {
        // Total pages in constructed Pager object.
        var $total_pages = 1;
        // Elements of target array per page.
        var $elem_per_page = 10;
        // Total number of target array's elements.
        var $count_elements = 0;
        // Do not use it.
        var $arr = array();

        // Class' constructor. Creates object.
        // Usage:
        // $pager = new Pager($target_array,$elems_per_page);
        //
        function Pager($arr=array(),$per_page=10) {
                $this->elem_per_page = $per_page;
                $this->count_elements = count($arr);
                if ( $this->count_elements % $per_page == 0 ) {
                        $this->total_pages = floor($this->count_elements/$per_page);
                }
                else {
                        $this->total_pages = floor($this->count_elements/$per_page)+1;
                }
                $this->arr = $arr;
        }

        // Method Page. Returns target array's page object number $pageno.
        // Usage:
        // $page = $pager->page($pageno);
        //
        function page($pageno) {
                $page = new Page($pageno);

                $from = $this->elem_per_page * ($pageno-1)+1;
                $to = $from + $this->elem_per_page-1;
                if ($to > $this->count_elements) {
                        $to = $this->count_elements;
                }

                $res = array();
                reset($this->arr);
                for ($i = ($from-1); $i < ($to); $i++) {
                        $res[]=$this->arr[$i];
                }

                $page->setFrom($from);
                $page->setTo($to);
                $page->setResult($res);
                return $page;
        }

        // Prints page numbers
        // Usage:
        // $url = "$PHP_SELF?myvar=test";
        // $pager->printPageNumbers($pageno,'series','numbers',$url,'pageno',$seriesrange);
        //
        // $pageno is current page number.
        // 'all' or 'series' prints all page numbers or just $seriesrange pages backward and forward from current page.
        // 'numbers' prints '[1] [2]' type page numbers, 'from' prints '[1] [13] [25]' type 
        // page numbers, 'fromto' prints '[1-12] [13-24] [25-36]' type page numbers.
        // $url prints numbers with given URL plus 'pageno' parameter as page numbers variable.
        // If you print 'all' page numbers, $seriesrange variable doesn't mean nothing.
        // 
        // Simplest way to use:
        // $pager->printPageNumbers($pageno);
        //
        function printPageNumbers($cp=1,$range='all',$type='numbers',$url='',$paramName='pageno',$seriesrange=2) {
                global $PHP_SELF;
                $range = (empty($range))?'all':$range;
                $type = (empty($types))?'numbers':$type;
                if (empty($url)) {
                        $url = $PHP_SELF.'?pageno=';
                }
                else {
                        if (preg_match('/\?/',$url)) {
                                $url = $url."&$paramName=";
                        }
                        else {
                                $url = $url."?$paramName=";
                        }
                }
                switch ($range) {
                        case 'all':
                                for ($i=1; $i <= $this->total_pages; $i++) {
                                        $page = $this->page($i);
                                        switch ($type) {
                                        case 'numbers':
                                                if ($i != $cp) {
                                                        echo "[<a href=\"$url$i\">$i</a>] ";
                                                }
                                                else {
                                                        echo "[$i] ";
                                                }
                                                break;
                                        case 'from':
                                                if ($i != $cp) {
                                                        echo "[<a href=\"$url$i\">$page->from</a>] ";
                                                }
                                                else {
                                                        echo "[$page->from] ";
                                                }
                                                break;
                                        case 'fromto':
                                                if ($i != $cp) {
                                                        echo "[<a href=\"$url$i\">$page->from-$page->to</a>] ";
                                                }
                                                else {
                                                        echo "[$page->from-$page->to] ";
                                                }
                                                break;
                                        }
                                }
                                break;
                        case 'series':
                                if ($cp == $this->total_pages) { 
                                        $seriesrange = $seriesrange*2;
                                }
                                else {
                                        if ($cp == 1) {
                                                $seriesrange = $seriesrange*2;
                                        }
                                }
                                $from = ($cp-$seriesrange < 1)? 1 : $cp-$seriesrange ;
                                $to = ($cp+$seriesrange > $this->total_pages)? $this->total_pages : $cp+$seriesrange ;
                                $prev = ($cp > 1)? $cp-1 : 1 ;
                                $next = ($cp < $this->total_pages)? $cp+1 : $this->total_pages ;
                                echo "<a href=\"${url}1\">&lt;&lt;</a> ";
                                echo "<a href=\"$url$prev\">&lt</a> ";
                                for ($i=$from; $i <= $to; $i++) {
                                        $page = $this->page($i);
                                        switch ($type) {
                                        case 'numbers':
                                                if ($i != $cp) {
                                                        echo "[<a href=\"$url$i\">$i</a>] ";
                                                }
                                                else {
                                                        echo "[$i] ";
                                                }
                                                break;
                                        case 'from':
                                                if ($i != $cp) {
                                                        echo "[<a href=\"$url$i\">$page->from</a>] ";
                                                }
                                                else {
                                                        echo "[$page->from] ";
                                                }
                                                break;
                                        case 'fromto':
                                                if ($i != $cp) {
                                                        echo "[<a href=\"$url$i\">$page->from-$page->to</a>] ";
                                                }
                                                else {
                                                        echo "[$page->from-$page->to] ";
                                                }
                                                break;
                                        }
                                }
                                echo "<a href=\"$url$next\">&gt;</a> ";
                                echo "<a href=\"$url$this->total_pages\">&gt;&gt;</a> ";
                                break;
                }
        }
}

?>