<?php
/*
 * PHP Pagination Class with bootstrap 4
 * @version 1.0.0
 */
class Paginator{
	var $items_per_page;
	var $items_total;
	var $current_page;
	var $num_pages;
	var $mid_range;
	var $low;
	var $limit;
	var $return;
	var $default_ipp;
	var $querystring;
	var $ipp_array;

	function Paginator()
	{
		$this->current_page = 1;
		$this->mid_range = 7;
		$this->ipp_array = array(10,25,50,100,150,200,'All');
		$this->items_per_page = (!empty($_GET['ipp'])) ? $_GET['ipp']:$this->default_ipp;
	}

	function paginate()
	{
		if(!isset($this->default_ipp)) $this->default_ipp=100;
		
		if($_GET['ipp'] == 'All')
		{
			$this->num_pages = 1;
		}
		else
		{
			if(!is_numeric($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);
		}
		
		$this->current_page = (isset($_GET['page'])) ? (int) $_GET['page'] : 1 ; // must be numeric > 0
		$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 > 1)
		{
			$this->return = ($this->current_page > 1 And $this->items_total >= 10) ? "<div class='row'><div class='col-sm-7'><ul class='pagination'><li class='page-item'><a class=\"page-link\" href=\"$_SERVER[PHP_SELF]?page=$prev_page&ipp=$this->items_per_page$this->querystring\">Previous</a></li> ":"<div class='row'><div class='col-sm-7'><ul class='pagination'><li class='page-item'><a href=\"javascript:;\" class=\"page-link disabled\" tabindex=\"-1\">Previous</a></li> ";

			$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]) $this->return .= " ... ";
				if($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')) ? "<li class='page-item active'><a title=\"Go to page $i of $this->num_pages\" class=\"page-link\" href=\"#\">$i</a></li> ":"<li class='page-item'><a class=\"page-link\" title=\"Go to page $i of $this->num_pages\" href=\"$_SERVER[PHP_SELF]?page=$i&ipp=$this->items_per_page$this->querystring\">$i</a></li> ";
				}
				//if($this->range[$this->mid_range-1] < $this->num_pages-1 And $i == $this->range[$this->mid_range-1]) $this->return .= " ... ";
				if($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') And $this->current_page > 0) ? "<li class='page-item'><a class=\"page-link\" href=\"$_SERVER[PHP_SELF]?page=$next_page&ipp=$this->items_per_page$this->querystring\">Next</a></li>\n":"<li class='page-item'><a href=\"javascript:;\" class=\"page-link disabled\" href=\"javascript:;\" tabindex=\"-1\">Next</a></li>\n";
			$this->return .= ($_GET['page'] == 'All') ? "<li class='page-item active'><a class=\"page-link\" hidden href=\"javascript:;\">All</a></li> \n":"<li class='page-item'><a class=\"page-link\" hidden href=\"$_SERVER[PHP_SELF]?page=1&ipp=All$this->querystring\">All</a></li></ul></div> \n";
		}
		else
		{
			for($i=1;$i<=$this->num_pages;$i++)
			{
				$this->return .= ($i == $this->current_page) ? "<div class='row'><div class='col-sm-7'><ul class='pagination'><li class='page-item active'><a class=\"page-link\" href=\"#\">$i</a></li> ":"<li class='page-item'><a class=\"page-link\" href=\"$_SERVER[PHP_SELF]?page=$i&ipp=$this->items_per_page$this->querystring\">$i</a></li> ";
			}
			$this->return .= "<li class='page-item'><a class=\"page-link\" href=\"$_SERVER[PHP_SELF]?page=1&ipp=All$this->querystring\">All</a></li></ul></div> \n";
		}
		$this->low = ($this->current_page <= 0) ? 0:($this->current_page-1) * $this->items_per_page;
		if($this->current_page <= 0) $this->items_per_page = 0;
		$this->limit = (isset($_GET['ipp']) && $_GET['ipp'] == 'All') ? "":" LIMIT $this->low,$this->items_per_page";
	}
	function display_items_per_page()
	{
		$items = '';
		if(!isset($_GET['ipp'])) $this->items_per_page = $this->default_ipp;
		foreach($this->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\">$ipp_opt</option> \n";
		return "<div class='col-sm-5 float-sm-right'><div class='form-row mt-2 text-right'><div class='col'><span class=\"text-muted\">Rows:</span> <select class=\"border rounded text-muted\" onchange=\"window.location='$_SERVER[PHP_SELF]?page=1&ipp='+this[this.selectedIndex].value+'$this->querystring';return false\">$items</select></div>\n";
	}
	function display_jump_menu()
	{
		$option = '';
		for($i=1;$i<=$this->num_pages;$i++)
		{
			$option .= ($i==$this->current_page) ? "<option value=\"$i\" selected>$i</option>\n":"<option value=\"$i\">$i</option> \n";
		}
		return "<div class='col'><span class=\"text-muted\">Page:</span> <select class=\"border rounded text-muted\" onchange=\"window.location='$_SERVER[PHP_SELF]?page='+this[this.selectedIndex].value+'&ipp=$this->items_per_page$this->querystring';return false\">$option</select></div><div class='col'><strong class='text-danger'>Total: ".$this->items_total."</strong></div></div></div></div>\n";
	}
	function display_pages()
	{
		return $this->return;
	}
}
?>