分页块

<?php
//分页函数
function page($total_records,$page_size,$page_current,$url,$keyword){
 $total_pages=ceil($total_records/$page_size);//总共多少页=总共多少条记录/一页多少条
 $page_previous=($page_current<=1)?1:$page_current-1;
    $page_next=($page_current>=$total_pages)?$total_pages:$page_current+1;
    $page_next=($page_next==0)?1:$page_next;
 $page_start=($page_current-5>0)?$page_current-5:0;
 $page_end=($page_start+10<$total_pages)?$page_start+10:$total_pages;
    $page_start=$page_end-10;
 if($page_start<0) $page_start=0;
 //判断$url中是否存在查询字符串
    $parse_url=parse_url($url);
 if(empty($parse_url["query"])){
  $url=$url.'?';//若不存在，在$url后添加？
 }else{
  $url=$url.'&';
 }
 if(empty($keyword)){
  $navigator="<a href=".$url."page_current=$page_previous>上一页</a>";
        for($i=$page_start;$i<$page_end;$i++){
   $j=$i+1;
   $navigator.="<a href='".$url."page_current=$j'>$j</a>";
  }
        $navigator.="<a href=".$url."page_current=$page_next>下一页</a>";
  $navigator.="<br/>共".$total_records."条记录，共".$total_pages."页，当前是第".$page_current."页";
 }
 else{
  $keyword=$_GET["keyword"];
  $navigator="<a href=".$url."keyword=$keyword&page_current=$page_previous>上一页</a>";
        for($i=$page_start;$i<$page_end;$i++){
   $j=$i+1;
   $navigator.="<a href='".$url."keyword=$keyword&page_current=$j'>$j</a>";
  }
        $navigator.="<a href=".$url."keyword=$keyword&page_current=$page_next>下一页</a>";
  $navigator.="<br/>共".$total_records."条记录，共".$total_pages."页，当前是第".$page_current."页";
 }
 echo $navigator;

 /*改进前的：
  if(empty($keyword)){
  $navigator="<a href=$url?page_current=$page_previous>上一页</a>";
        for($i=$page_start;$i<$page_end;$i++){
   $j=$i+1;
   $navigator.="<a href='$url?page_current=$j'>$j</a>";
  }
        $navigator.="<a href=$url?page_current=$page_next>下一页</a>";
  $navigator.="<br/>共".$total_records."条记录，共".$total_pages."页，当前是第".$page_current."页";
 }
 else{
  $keyword=$_GET["keyword"];
  $navigator="<a href=$url?keyword=$keyword&page_current=$page_previous>上一页</a>";
        for($i=$page_start;$i<$page_end;$i++){
   $j=$i+1;
   $navigator.="<a href='$url?keyword=$keyword&page_current=$j'>$j</a>";
  }
        $navigator.="<a href=$url?keyword=$keyword&page_current=$page_next>下一页</a>";
  $navigator.="<br/>共".$total_records."条记录，共".$total_pages."页，当前是第".$page_current."页";
 }
 echo $navigator;*/
}
?>