pagination.php

<?php
namespace Library;

class Pagination{
/*
*/
		/*Default values*/
		var $total_pages = -1;//items
		var $limit = null;
		var $target = ""; 
		var $page = 1;
		var $adjacents = 2;
		var $showCounter = false;
		var $className = "pagination pagination-sm";
		var $parameterName = "page";
		var $urlF = false;//urlFriendly

		/*Buttons next and previous*/
		var $nextT = "Next";
		var $nextI = "&#187;"; //&#9658;
		var $prevT = "Previous";
		var $prevI = "&#171;"; //&#9668;

		/*****/
		var $calculate = false;
		
		#Total items
		function items($value){$this->total_pages = (int) $value;}
		
		#how many items to show per page
		function limit($value){$this->limit = (int) $value;}
		
		#Page to sent the page value
		function target($value){$this->target = $value;}
		
		#Current page
		function currentPage($value){$this->page = (int) $value;}
		
		#How many adjacent pages should be shown on each side of the current page?
		function adjacents($value){$this->adjacents = (int) $value;}
		
		#show counter?
		function showCounter($value=""){$this->showCounter=($value===true)?true:false;}

		#to change the class name of the pagination div
		function changeClass($value=""){$this->className=$value;}

		function nextLabel($value){$this->nextT = $value;}
		function nextIcon($value){$this->nextI = $value;}
		function prevLabel($value){$this->prevT = $value;}
		function prevIcon($value){$this->prevI = $value;}

		#to change the class name of the pagination div
		function parameterName($value=""){$this->parameterName=$value;}

		#to change urlFriendly
		function urlFriendly($value="%"){
				if(preg_match('/^ *$/',$value)){
						$this->urlF=false;
						return false;
					}
				$this->urlF=$value;
			}
		
		var $pagination;

		function pagination(){}
		function show(){
				if(!$this->calculate)
					if($this->calculate())
						echo "<ul class=\"$this->className\">$this->pagination</ul>\n";
			}
		function getOutput(){
				if(!$this->calculate)
					if($this->calculate())
						return "<div class=\"$this->className\">$this->pagination</div>\n";
			}
		function get_pagenum_link($id){
				if(strpos($this->target,'?')===false)
						if($this->urlF)
								return str_replace($this->urlF,$id,$this->target);
							else
								return "$this->target?$this->parameterName=$id";
					else
						return "$this->target&$this->parameterName=$id";
			}
		
		function calculate(){
				$this->pagination = "";
				$this->calculate == true;
				$error = false;
				if($this->urlF and $this->urlF != '%' and strpos($this->target,$this->urlF)===false){
						//Es necesario especificar el comodin para sustituir
						echo "Especificaste un wildcard para sustituir, pero no existe en el target<br />";
						$error = true;
					}elseif($this->urlF and $this->urlF == '%' and strpos($this->target,$this->urlF)===false){
						echo "Es necesario especificar en el target el comodin % para sustituir el número de página<br />";
						$error = true;
					}

				if($this->total_pages < 0){
						echo "It is necessary to specify the <strong>number of pages</strong> (\$class->items(1000))<br />";
						$error = true;
					}
				if($this->limit == null){
						echo "It is necessary to specify the <strong>limit of items</strong> to show per page (\$class->limit(10))<br />";
						$error = true;
					}
				if($error)return false;
				
				$n = trim($this->nextT.' '.$this->nextI);
				$p = trim($this->prevI.' '.$this->prevT);
				
				/* Setup vars for query. */
				if($this->page) 
					$start = ($this->page - 1) * $this->limit;             //first item to display on this page
				else
					$start = 0;                                //if no page var is given, set start to 0
			
				/* Setup page vars for display. */
				$prev = $this->page - 1;                            //previous page is page - 1
				$next = $this->page + 1;                            //next page is page + 1
				$lastpage = ceil($this->total_pages/$this->limit);        //lastpage is = total pages / items per page, rounded up.
				$lpm1 = $lastpage - 1;                        //last page minus 1
				
				/* 
					Now we apply our rules and draw the pagination object. 
					We're actually saving the code to a variable in case we want to draw it more than once.
				*/
				
				if($lastpage > 1){
						if($this->page){
								//anterior button
								if($this->page > 1)
										$this->pagination .= "<li><a href=\"".$this->get_pagenum_link($prev)."\" class=\"prev\">$p</a></li>";
									else
										$this->pagination .= "<li class=\"disabled\"><span>$p</span></li>";
							}
						//pages	
						if ($lastpage < 7 + ($this->adjacents * 2)){//not enough pages to bother breaking it up
								for ($counter = 1; $counter <= $lastpage; $counter++){
										if ($counter == $this->page)
												$this->pagination .= "<li class=\"active\"><span>$counter</span></li>";
											else
												$this->pagination .= "<li><a href=\"".$this->get_pagenum_link($counter)."\">$counter</a></li>";
									}
							}
						elseif($lastpage > 5 + ($this->adjacents * 2)){//enough pages to hide some
								//close to beginning; only hide later pages
								if($this->page < 1 + ($this->adjacents * 2)){
										for ($counter = 1; $counter < 4 + ($this->adjacents * 2); $counter++){
												if ($counter == $this->page)
														$this->pagination .= "<li class=\"active\"><span>$counter</span></li>";
													else
														$this->pagination .= "<li><a href=\"".$this->get_pagenum_link($counter)."\">$counter</a></li>";
											}
										$this->pagination .= "<li><span>...</span></li>";
										$this->pagination .= "<li><a href=\"".$this->get_pagenum_link($lpm1)."\">$lpm1</a></li>";
										$this->pagination .= "<li><a href=\"".$this->get_pagenum_link($lastpage)."\">$lastpage</a></li>";
									}
								//in middle; hide some front and some back
								elseif($lastpage - ($this->adjacents * 2) > $this->page && $this->page > ($this->adjacents * 2)){
										$this->pagination .= "<li><a href=\"".$this->get_pagenum_link(1)."\">1</a></li>";
										$this->pagination .= "<li><a href=\"".$this->get_pagenum_link(2)."\">2</a></li>";
										$this->pagination .= "<li><span>...</span></li>";
										for ($counter = $this->page - $this->adjacents; $counter <= $this->page + $this->adjacents; $counter++)
											if ($counter == $this->page)
													$this->pagination .= "<li class=\"active\"><span>$counter</span></li>";
												else
													$this->pagination .= "<li><a href=\"".$this->get_pagenum_link($counter)."\">$counter</a></li>";
										$this->pagination .= "<li><span>...</span></li>";
										$this->pagination .= "<li><a href=\"".$this->get_pagenum_link($lpm1)."\">$lpm1</a></li>";
										$this->pagination .= "<li><a href=\"".$this->get_pagenum_link($lastpage)."\">$lastpage</a></li>";
									}
								//close to end; only hide early pages
								else{
										$this->pagination .= "<li><a href=\"".$this->get_pagenum_link(1)."\">1</a></li>";
										$this->pagination .= "<li><a href=\"".$this->get_pagenum_link(2)."\">2</a></li>";
										$this->pagination .= "<li><span>...</span></li>";
										for ($counter = $lastpage - (2 + ($this->adjacents * 2)); $counter <= $lastpage; $counter++)
											if ($counter == $this->page)
													$this->pagination .= "<li class=\"active\"><span >$counter</span></li>";
												else
													$this->pagination .= "<li><a href=\"".$this->get_pagenum_link($counter)."\">$counter</a></li>";
									}
							}
						if($this->page){
								//siguiente button
								if ($this->page < $counter - 1)
										$this->pagination .= "<li><a href=\"".$this->get_pagenum_link($next)."\" class=\"next\">$n</a></li>";
									else
										$this->pagination .= "<li class=\"disabled\"><span>$n</span></li>";
									if($this->showCounter)$this->pagination .= "<div class=\"pagination_data\">($this->total_pages Pages)</div>";
							}
					}

				return true;
			}
	}
?>