Question

php分页函数在php-5.2.6版本中出错了

php分页函数在php-5.2.12版本中可以运行，可以用php-5.2.6就出错了。
if (empty($_GET['page'])==true){
$pagen=0;
}else{
$pagen=$_GET['page']-1;
}
请求大家帮忙
我查了一下是/classes/Page.php这个页的分页函数不支持php-5.2.6怎么办呀？

Answer 1

<?php
class ArrayCalculator
{
var $num_of_pages;
var $current_page;
var $previous_page = false;
var $next_page = false;
var $results;
var $conn;
var $num_of_results;
var $return_results;
var $results_per_page;
var $from;
var $to;

public function __construct($results, $current_page = '1', $results_per_page = '10')
{
$this->results = $results;
$this->calculate_results();
$this->previous_page = 0;
$this->next_page = 0;
$this->calculate_results_per_page($results_per_page);
$this->calculate_pages($current_page);
$this->calculate_return_results();
}

public function calculate_results()
{
$this->num_of_results = count($this->results);
}

public function calculate_results_per_page($results_per_page)
{
$this->results_per_page = intval($results_per_page);
}

public function calculate_pages($current_page)
{
$this->count_pages();

$current_page = intval($current_page);
if($current_page > 0 && $current_page <= $this->num_of_pages) {
$this->current_page = $current_page;
} else {
$this->current_page = 1;
}

if($this->current_page > 1) {
$this->previous_page = $this->current_page - 1;
}
if($this->current_page < $this->num_of_pages) {
$this->next_page = $this->current_page + 1;
}

$this->from = $this->results_per_page * ($this->current_page - 1) + 1;
$this->to = $this->results_per_page * $this->current_page;
if($this->to > $this->num_of_results) {
$this->to = $this->num_of_results;
}
}

public function count_pages()
{
$result1 = $this->num_of_results / $this->results_per_page;
$result2 = intval($this->num_of_results / $this->results_per_page);
$temp_of_return = 0;
if($result1 > $result2) {
$temp_of_return = $result2 + 1;
} elseif($result1 == $result2) {
$temp_of_return = $result2;
} else {
$temp_of_return = $result2;
}
$this->num_of_pages = $temp_of_return;
}

/**
* Cut the array to small arrays.
* @access public.
*/
public function calculate_return_results()
{
$temp_array = array_chunk($this->results, $this->results_per_page);
$this->return_results = $temp_array[$this->current_page - 1];
}
}
?>

给你一个分页类
使用方法：
<?php
$arr = range(1, 1000);
$current = 5; //当前页面id
$per = 20; //每页记录个数
$pager = new ArrayCalculator($arr, $current, $per);
print_r($pager->return_results);
unset($pager);
?>

Answer 2

if ( isset( $_GET['page'] )
&& is_numeric( $_GET['page'] ) ) {
$pagen=$_GET['page']-1;
}
else {
$pagen=0;
}

什么分页函数，分页是利用读取数据库时的 limit 实现的