PHP 分页类(模仿google)-面试题目解答

笔试回答的不太好，特别是JS部分，也是许久都没复习的原因。
上机题目是要写一个仿google分页的类，当要取类似9/2的最大整数，却怎么也想不起函数ceil的名字，晕了半天。
最后测试程序没错误，但是就是不能正常显示，后来（回家后）一查才知道是语句：for($i=0;$i++;$i<9)写错了，于是下决心重新写一遍，于是就有了下面的代码了：

<?php 
/* 
显示样式如下： 
[1] 2 3 4 5 6 7 8 9 10 ...100 下页 尾页 
首页 上页 1..12 13 14 15 [16] 17 18 19 20 ...100 下页 尾页 
首页 上页 1..92 93 94 95 96 97 98 [99] 100 使用方法： 
$currentPage = $_GET['page']?$_GET['page']:1; 
$pagediv = new pagediv(500, 10, 11, $currentPage, 'test.php?page='); 
$pagediv->show(); 
*/ 
class pagediv 
{ 
public $part1; 
public $part2; 
public $part3; 
public $part4; 
public $part5; 
/* 
对下面的分页显示进行分割: 
首页 上页 1..12 13 14 15 [16] 17 18 19 20 ...100 下页 尾页 
$part1 : 首页 上页 
$part2 : 1.. 
$part3 : 12 13 14 15 [16] 17 18 19 20 
$part4 : ...100 
$part5 : 下页 尾页 
*/ 
public $allPage; //总页数 
public $allRocords; //总记录数 
public $perPage; //每页记录数 
public $showPagesNo; //显示分页栏的总页码数 显示样式里共有11个 
public $currentPage; //当前页 
public $urlModel; //Url链接样式 
public $startHidden; //出现 1... 时的页数 开始隐藏中间页 
public $endHidden; //出现 ...100 时的页数 结束隐藏中间页 
public function __construct($allRocords, $perPage, $showPagesNo, $currentPage, $urlModel){ 
$this->allRocords = $allRocords; 
$this->perPage = $perPage; 
$this->showPagesNo = $showPagesNo; 
$this->currentPage = $currentPage; 
$this->urlModel = $urlModel; 
$this->allPage = $this->getAllPage(); 
$this->startHidden = $this->getInt(($this->showPagesNo)/2); //6 
$this->endHidden = $this->allPage - $this->startHidden; //94 
} 
public function getUrl($_index = ''){ 
$_current = $_index; 
if($_index == 'pre') $_current = $this->currentPage -1; 
if($_index == 'next') $_current = $this->currentPage+1; 
if($_index == '') $_current = $this->allPage; 
return $this->urlModel.$_current; 
} 
public function getAllPage(){ 
return $this->getInt($this->allRocords/$this->perPage); 
} 
public function getInt($_float){ 
$_int = $_float; 
if( $_index = strpos($_float,'.') == true ){ 
$_int = substr($_float,0,$_index); 
$_int++; 
} 
//没有想起ceil时的候补方案 
return $_int; 
} 
public function getPart1(){ 
$content = '<a href="'.$this->getUrl(1).'">首页</a> <a href="'.$this->getUrl('pre').'">上页</a> '; 
if($this->currentPage <= $this->startHidden){ 
$content = ''; 
} 
return $content; 
} 
public function getPart2(){ 
$content = '<a href="'.$this->getUrl(1).'">1</a> '; 
$add = ''; 
if($this->currentPage > $this->startHidden){ 
$add = '...'; 
} 
if($this->currentPage == 1){ 
$content = '[1] '; 
$add = ''; 
} 
$part2 = $content.$add; 
return $part2; 
} 
public function getPart3(){ 
$content = ''; 
if($this->currentPage <= $this->startHidden){ 
//[1] 2 3 4 5 6 7 8 9 10 ...100 下页 尾页 
$long = $this->showPagesNo - 2; 
for($i=0;$i<$long;$i++){ 
$j = $i+2; 
if($j == $this->currentPage){ 
$content .= '['.$this->currentPage.'] '; 
}else{ 
$content .= '<a href="'.$this->getUrl($j).'">'.$j.'</a> '; 
} 
} 
}elseif( $this->currentPage >= $this->endHidden ){ 
//首页 上页 1..92 93 94 95 96 97 98 [99] 100 
$long = $this->showPagesNo - 2; 
$_start = $this->allPage - $long; 
for($i=0;$i<$long;$i++){ 
$j = $_start + $i; 
if($j == $this->currentPage){ 
$content .= '['.$this->currentPage.'] '; 
}else{ 
$content .= '<a href="'.$this->getUrl($j).'">'.$j.'</a> '; 
} 
} 
}else{ 
//首页 上页 1..12 13 14 15 [16] 17 18 19 20 ...100 下页 尾页 
$long = $this->showPagesNo - 2; 
$offset = $this->getInt($long/2) - 1; 
$_start = $this->currentPage - $offset; 
for($i=0;$i<$long;$i++){ 
$j = $_start + $i; 
if($j == $this->currentPage){ 
$content .= '['.$this->currentPage.'] '; 
}else{ 
$content .= '<a href="'.$this->getUrl($j).'">'.$j.'</a> '; 
} 
} 
} 
$part3 = $content; 
return $part3; 
} 
public function getPart4(){ 
$content = '<a href="'.$this->getUrl().'">'.$this->allPage.'</a> '; 
$add = ''; 
if($this->currentPage < $this->endHidden){ 
$add = '...'; 
} 
if($this->currentPage == $this->allPage){ 
$content = '['.$this->allPage.']'; 
$add = ''; 
} 
$part4 = $add.$content; 
return $part4; 
} 
public function getPart5(){ 
$content = '<a href="'.$this->getUrl('next').'">下页</a> <a href="'.$this->getUrl().'">尾页</a>'; 
if($this->currentPage >= $this->endHidden){ 
$content = ''; 
} 
return $content; 
} 
public function show(){ 
//判断非法 
if(!is_numeric($this->currentPage) || $this->currentPage < 0 || $this->currentPage > $this->allPage){ 
print 'error:pageNo is flase'; 
return; 
} 
//总页数没有达到显示分页栏的总页码数，则全部显示 
if($this->allPage < $this->showPagesNo){ 
$long = $this->allPage; 
for($i=0;$i<$long;$i++){ 
$j = $i+1; 
if($j == $this->currentPage){ 
$content .= '['.$this->currentPage.'] '; 
}else{ 
$content .= '<a href="'.$this->getUrl($j).'">'.$j.'</a> '; 
} 
} 
print $content; 
return; 
} 
$this->part1 = $this->getPart1(); 
$this->part2 = $this->getPart2(); 
$this->part3 = $this->getPart3(); 
$this->part4 = $this->getPart4(); 
$this->part5 = $this->getPart5(); 
print $this->part1.$this->part2.$this->part3.$this->part4.$this->part5; 
} 
} 
?>