php分页

<?php
$str=pagestr("http:www.abc.com?",195,11,10,8);
print($str);
//url连接，countdatas表数据总行数，currentpage第几页（0是第一页），everpage每页多少行,beforlaterln前后长度
function pagestr($url,$countdatas,$currentpage=0,$everpage=10,$beforlaterln=5){
    $page="";
    $intpart=$countdatas/$everpage;
    $remainderpart=$countdatas%$everpage;//余数
    $countpage=floor($intpart);//取整数
    $currentpage = $currentpage<0 ? 0:$currentpage;
    if($remainderpart==0){//余数判断
        $currentpage=$currentpage>$countpage-1?$countpage-1:$currentpage;
        $countpage;//总页数
        $pp=$currentpage+1;
        $strbe="";
        $pagebefore=$pp-$beforlaterln-1;
        for($i=$pp; $i > $pagebefore; $i--){ 
            if($i>0 && $i<$pp){
                $strbe="<a class='num' href='".$url."&p=".($i-1)."'>".$i."</a>".$strbe;
            }
        }
        if($pp<=1){$strbe="";}else{$strbe="<a class='num' href='".$url."&p=0'>首页</a>"."<a class='num' href='".$url."&p=".($pp-2)."'>上一页</a>".$strbe;}
        $strmid="<span class='current'>".$pp."</span>";
        $strlater="";
        $pagelater=$pp+$beforlaterln;
        for($i=$pp; $i < $pagelater; $i++){ 
            if($i<$countpage){
                $strlater.="<a class='num' href='".$url."&p=".($i)."'>".($i+1)."</a>";
            }
        }
        if($pp>=$countpage){}else{$strlater.="<a class='num' href='".$url."&p=".$pp."'>下一页</a>"."<a class='num' href='".$url."&p=".($countpage-1)."'>尾页</a>";}
        $page=$strbe.$strmid.$strlater;
    }else{
        $countpage+=1;//总页数
        $currentpage=$currentpage>$countpage-1?$countpage-1:$currentpage;
        $pp=$currentpage+1;
        $strbe="";
        $pagebefore=$pp-$beforlaterln-1;
        for($i=$pp; $i > $pagebefore; $i--){ 
            if($i>0 && $i<$pp){
                $strbe="<a class='num' href='".$url."&p=".($i-1)."'>".$i."</a>".$strbe;
            }
        }
        if($pp<=1){$strbe="";}else{$strbe="<a class='num' href='".$url."&p=0'>首页</a>"."<a class='num' href='".$url."&p=".($pp-2)."'>上一页</a>".$strbe;}
        $strmid="<span class='current'>".$pp."</span>";
        $strlater="";
        $pagelater=$pp+$beforlaterln;
        for($i=$pp; $i < $pagelater; $i++){
            if($i<$countpage){
                $strlater.="<a class='num' href='".$url."&p=".($i)."'>".($i+1)."</a>";
            }
        }
        if($pp>=$countpage){}else{$strlater.="<a class='num' href='".$url."&p=".$pp."'>下一页</a>"."<a class='num' href='".$url."&p=".($countpage-1)."'>尾页</a>";}
        $page=$strbe.$strmid.$strlater;
    }
    return "共".$countpage."页".$page;
}
?>

共20页<a class='num' href='http://www.abc.com?&p=0'>首页</a>
<a class='num' href='http://www.abc.com?&p=10'>上一页</a>
<a class='num' href='http://www.abc.com?&p=3'>4</a>
<a class='num' href='http://www.abc.com?&p=4'>5</a>
<a class='num' href='http://www.abc.com?&p=5'>6</a>
<a class='num' href='http://www.abc.com?&p=6'>7</a>
<a class='num' href='http://www.abc.com?&p=7'>8</a>
<a class='num' href='http://www.abc.com?&p=8'>9</a>
<a class='num' href='http://www.abc.com?&p=9'>10</a>
<a class='num' href='http://www.abc.com?&p=10'>11</a>
<span class='current'>12</span>
<a class='num' href='http://www.abc.com?&p=12'>13</a>
<a class='num' href='http://www.abc.com?&p=13'>14</a>
<a class='num' href='http://www.abc.com?&p=14'>15</a>
<a class='num' href='http://www.abc.com?&p=15'>16</a>
<a class='num' href='http://www.abc.com?&p=16'>17</a>
<a class='num' href='http://www.abc.com?&p=17'>18</a>
<a class='num' href='http://www.abc.com?&p=18'>19</a>
<a class='num' href='http://www.abc.com?&p=19'>20</a>
<a class='num' href='http://www.abc.com?&p=12'>下一页</a>
<a class='num' href='http://www.abc.com?&p=19'>尾页</a>