PHP Digg风格的分页

Posted 2021-05-15

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function getPaginationString($page = 1, $totalitems, $limit = 15, $adjacents = 1, $targetpage = &quot;/&quot;, $pagestring = &quot;?page=&quot;)
    {
    	//defaults
    	if(!$adjacents) $adjacents = 1;
    	if(!$limit) $limit = 15;
    	if(!$page) $page = 1;
    	if(!$targetpage) $targetpage = &quot;/&quot;;

    	//other vars
    	$prev = $page - 1;									//previous page is page - 1
    	$next = $page + 1;									//next page is page + 1
    	$lastpage = ceil($totalitems / $limit);				//lastpage is = total items / 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.
    	*/
    	$pagination = &quot;&quot;;
    	if($lastpage &gt; 1)
    	{
    		$pagination .= &quot;&lt;div class=\&quot;pagination\&quot;&quot;;
    		if($margin || $padding)
    		{
    			$pagination .= &quot; style=\&quot;&quot;;
    			if($margin)
    				$pagination .= &quot;margin: $margin;&quot;;
    			if($padding)
    				$pagination .= &quot;padding: $padding;&quot;;
    			$pagination .= &quot;\&quot;&quot;;
    		}
    		$pagination .= &quot;&gt;&quot;;

    		//previous button
    		if ($page &gt; 1)
    			$pagination .= &quot;&lt;a href=\&quot;$targetpage$pagestring$prev\&quot;&gt;&amp;laquo; previous&lt;/a&gt;&quot;;
    		else
    			$pagination .= &quot;&lt;span class=\&quot;disabled\&quot;&gt;&amp;laquo; previous&lt;/span&gt;&quot;;

    		//pages
    		if ($lastpage &lt; 7 + ($adjacents * 2))	//not enough pages to bother breaking it up
    		{
    			for ($counter = 1; $counter &lt;= $lastpage; $counter++)
    			{
    				if ($counter == $page)
    					$pagination .= &quot;&lt;span class=\&quot;current\&quot;&gt;$counter&lt;/span&gt;&quot;;
    				else
    					$pagination .= &quot;&lt;a href=\&quot;&quot; . $targetpage . $pagestring . $counter . &quot;\&quot;&gt;$counter&lt;/a&gt;&quot;;
    			}
    		}
    		elseif($lastpage &gt;= 7 + ($adjacents * 2))	//enough pages to hide some
    		{
    			//close to beginning; only hide later pages
    			if($page &lt; 1 + ($adjacents * 3))
    			{
    				for ($counter = 1; $counter &lt; 4 + ($adjacents * 2); $counter++)
    				{
    					if ($counter == $page)
    						$pagination .= &quot;&lt;span class=\&quot;current\&quot;&gt;$counter&lt;/span&gt;&quot;;
    					else
    						$pagination .= &quot;&lt;a href=\&quot;&quot; . $targetpage . $pagestring . $counter . &quot;\&quot;&gt;$counter&lt;/a&gt;&quot;;
    				}
    				$pagination .= &quot;&lt;span class=\&quot;elipses\&quot;&gt;...&lt;/span&gt;&quot;;
    				$pagination .= &quot;&lt;a href=\&quot;&quot; . $targetpage . $pagestring . $lpm1 . &quot;\&quot;&gt;$lpm1&lt;/a&gt;&quot;;
    				$pagination .= &quot;&lt;a href=\&quot;&quot; . $targetpage . $pagestring . $lastpage . &quot;\&quot;&gt;$lastpage&lt;/a&gt;&quot;;
    			}
    			//in middle; hide some front and some back
    			elseif($lastpage - ($adjacents * 2) &gt; $page &amp;&amp; $page &gt; ($adjacents * 2))
    			{
    				$pagination .= &quot;&lt;a href=\&quot;&quot; . $targetpage . $pagestring . &quot;1\&quot;&gt;1&lt;/a&gt;&quot;;
    				$pagination .= &quot;&lt;a href=\&quot;&quot; . $targetpage . $pagestring . &quot;2\&quot;&gt;2&lt;/a&gt;&quot;;
    				$pagination .= &quot;&lt;span class=\&quot;elipses\&quot;&gt;...&lt;/span&gt;&quot;;
    				for ($counter = $page - $adjacents; $counter &lt;= $page + $adjacents; $counter++)
    				{
    					if ($counter == $page)
    						$pagination .= &quot;&lt;span class=\&quot;current\&quot;&gt;$counter&lt;/span&gt;&quot;;
    					else
    						$pagination .= &quot;&lt;a href=\&quot;&quot; . $targetpage . $pagestring . $counter . &quot;\&quot;&gt;$counter&lt;/a&gt;&quot;;
    				}
    				$pagination .= &quot;...&quot;;
    				$pagination .= &quot;&lt;a href=\&quot;&quot; . $targetpage . $pagestring . $lpm1 . &quot;\&quot;&gt;$lpm1&lt;/a&gt;&quot;;
    				$pagination .= &quot;&lt;a href=\&quot;&quot; . $targetpage . $pagestring . $lastpage . &quot;\&quot;&gt;$lastpage&lt;/a&gt;&quot;;
    			}
    			//close to end; only hide early pages
    			else
    			{
    				$pagination .= &quot;&lt;a href=\&quot;&quot; . $targetpage . $pagestring . &quot;1\&quot;&gt;1&lt;/a&gt;&quot;;
    				$pagination .= &quot;&lt;a href=\&quot;&quot; . $targetpage . $pagestring . &quot;2\&quot;&gt;2&lt;/a&gt;&quot;;
    				$pagination .= &quot;&lt;span class=\&quot;elipses\&quot;&gt;...&lt;/span&gt;&quot;;
    				for ($counter = $lastpage - (1 + ($adjacents * 3)); $counter &lt;= $lastpage; $counter++)
    				{
    					if ($counter == $page)
    						$pagination .= &quot;&lt;span class=\&quot;current\&quot;&gt;$counter&lt;/span&gt;&quot;;
    					else
    						$pagination .= &quot;&lt;a href=\&quot;&quot; . $targetpage . $pagestring . $counter . &quot;\&quot;&gt;$counter&lt;/a&gt;&quot;;
    				}
    			}
    		}

    		//next button
    		if ($page &lt; $counter - 1)
    			$pagination .= &quot;&lt;a href=\&quot;&quot; . $targetpage . $pagestring . $next . &quot;\&quot;&gt;next &amp;raquo;&lt;/a&gt;&quot;;
    		else
    			$pagination .= &quot;&lt;span class=\&quot;disabled\&quot;&gt;next &amp;raquo;&lt;/span&gt;&quot;;
    		$pagination .= &quot;&lt;/div&gt;\n&quot;;
    	}

    	return $pagination;

    }

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