PHP分页函数

我们经常会从数据库里读取的数据显示出来，当数据行较多时就需要把数据分页显示。
这里写了一个通用的分页函数：paging.func.php

<?php/** * 数据分页函数 * @param integer $count     数据总行数 * @param integer $showCount 显示行数 * @param integer $index     当前页号 * @param integer $navCount  导航最大项数 * @return array( *    'curIndex' => 当前页号, *    'pageCount' => 总页数, *    'beginIndex' => 当前页开始行, *    'endIndex' => 当前页结束行, *    'count' => 数据行数, *    'nav' => array( *        'curIndex' => 当前页号, *        'beginIndex' => 分页导航开始页, *        'endIndex' => 分页导航结束页, *        'prevIndex' => 上一页, *        'nextIndex' => 下一页, *        'firstIndex' => 首页, *        'lastIndex' => 尾页, *    ) * ) */function Paging($count, $showCount, $index, $navCount){    $pageCount = (integer)($count / $showCount);    if($count % $showCount){        $pageCount += 1;    }    $beginIndex = $index * $showCount;    $endIndex = $beginIndex + $showCount;    if($endIndex > $count){        $endIndex = $count;    }    $ret = array(        'pageCount' => $pageCount,        'curIndex' => $index,        'beginIndex' => $beginIndex,        'endIndex' => $endIndex,        'count' => $count,    );    $beginIndex = $index - (integer)($navCount / 2);    if($beginIndex < 0){        $beginIndex = 0;    }    $endIndex = $beginIndex + $navCount;    if($endIndex > $pageCount){        $endIndex = $pageCount;        $beginIndex = max(0, $endIndex - $navCount);    }    $ret['nav'] = array(        'beginIndex' => $beginIndex,        'endIndex' => $endIndex,        'curIndex' => $index,        'prevIndex' => max(0, $index - 1),        'nextIndex' => min($pageCount, $index + 1),        'firstIndex' => 0,        'lastIndex' => $pageCount - 1,    );    return $ret;}?>

使用例子：test-paging.php

<?phprequire 'paging.func.php';/** * 随机生成字符串 * @param string $length 字符串长度 */function RandomString($length){    static $range = '0123456789qwertyuiopasdfghjklzxcvbnm';    $rangeLen = strlen($range);    $string = '';    for($i = 0 ; $i < $length; ++ $i){        $string .= $range[mt_rand(0, $rangeLen - 1)];    }    return $string;}/** * 查询数据 * @param integer $count 数据表行数 */function QueryData($count){    for($i = 0; $i < $count; ++ $i){        $data[$i] = array(            'id' => ($i + 1000),            'name' => RandomString(mt_rand(4, 10)),        );    }    return $data;}/** * 显示数据表 * @param  array   $data      数据表 * @param  integer $showCount 每页行数 * @param  integer $count     总行数 * @param  integer $index     当前页号 * @param  integer $navCount  导航显示页数 */function showData($data, $showCount, $count, $index, $navCount){    $pag = Paging($count, $showCount, $index, $navCount);    echo "<table>";    echo "<tr><th>id</th><th>name</td><tr>";    for($i = $pag['beginIndex']; $i < $pag['endIndex']; ++ $i){        $row = &$data[$i];        echo "<tr>";            echo "<td>{$row['id']}</td>";            echo "<td>{$row['name']}</td>";        echo "</tr>";    }    echo "</table>";    echo "</div>";    $nav = &$pag['nav'];    if(0 < $pag['curIndex']){        echo " <a href='?index={$nav['firstIndex']}'>首页</a>";        echo " <a href='?index={$nav['prevIndex']}'>上一页</a>";    }    for($i = $nav['beginIndex']; $i < $nav['endIndex']; ++ $i){        $showNum = $i + 1;        if($i == $index){            echo " <span>{$showNum}</span>";        }else{            echo " <a href='?index={$i}'><b>{$showNum}</b></a>";        }    }    if($pag['curIndex'] + 1 < $pag['pageCount']){        echo " <a href='?index={$nav['nextIndex']}'>下一页</a>";        echo " <a href='?index={$nav['lastIndex']}'>尾页</a>";    }    echo " 总{$pag['pageCount']}页 {$pag['count']}条";    echo "</div>";}$data = QueryData(75);$index = isset($_REQUEST['index']) ? $_REQUEST['index'] : 0;showData($data, 10, 75, $index, 5);?>

测试截图：