pagination class

index.php

class pager{
    
    /*
        $pager = new pager;
        $pager->paginate(400);
     */
    
    private $limit  = 5;
    private $offset;
    private $row_count;
    private $page_count;
    private $cur_page;
    
    private $getvar = 'p';
    private $range  = 3;
    
    
    public function paginate($row_count=null,$limit=null){
        
        if(!is_null($limit))$this->limit = $limit;
        
        $this->row_count = isset($row_count) ? $row_count : 1;
        
        $base_url = $_SERVER['HTTP_HOST'] . $_SERVER['PHP_SELF'];
        $this->link = 'http://'.$base_url.'?'.$this->getvar.'=%d';
        
        $this->page_count = ceil($this->row_count/$this->limit);
        
        $pg = isset($_GET[$this->getvar]) ? $_GET[$this->getvar] : 1;
        $this->cur_page = preg_replace('/[^0-9]/','',$pg);
        
        switch(TRUE){
            case empty($this->cur_page):
                $this->cur_page = 1;
                break;
            case $this->cur_page < 1:
                $this->cur_page = 1;
                break;
            case $this->cur_page > $this->page_count:
                $this->cur_page = $this->page_count;
                break;
        }
        $this->offset = $this->cur_page * $this->limit;

        $current_range = [($this->cur_page - $this->range < 1 ? 1 : $this->cur_page - $this->range),($this->cur_page + $this->range > $this->page_count ? $this->page_count : $this->cur_page + $this->range)];

        $first_page = $this->cur_page > 3 ? '<a href="'.sprintf($this->link, '1').'">1</a>'.($this->cur_page < 5 ? ', ' : ' ... ') : null;
        $last_page = $this->cur_page < $this->page_count-2 ? ($this->cur_page > $this->page_count-4 ? ', ' : ' ... ').'<a href="'.sprintf($this->link, $this->page_count).'">'.$this->page_count.'</a>' : null;

        $previous_page = $this->cur_page > 1           ? '<a href="'.sprintf($this->link, ($this->cur_page-1)).'">Previous </a>' : null;
        $next_page     = $this->cur_page < $this->page_count ? '<a href="'.sprintf($this->link, ($this->cur_page+1)).'"> Next    </a>' : null;

        for($x=$current_range[0];$x <= $current_range[1]; ++$x){
            $pages[] = '<a href="'.sprintf($this->link, $x).'">'.($x == $this->cur_page ? '<strong>'.$x.'</strong>' : $x).'</a>';
        }
        
        if($this->page_count > 1){
            echo '<div class="paginate">'.$previous_page.$first_page.implode(', ', $pages).$last_page.$next_page.'</div>';
        }
        
        $this->vars();
    }
    
    public function vars(){
        pr('Limit: '.$this->limit);
        pr('Offset: '.$this->offset);
        pr('Current Page: '.$this->cur_page);
        pr('Total Rows: '.$this->row_count);
        pr('Total Pages: '.$this->page_count);

    }
    
}