paginazione array

[whisher]

Un semplice esempio:

<?php 
class Pager{
    private $numRecs;
    private $totalRecs;
    public $output;
    public function __construct($dataFile,$numRecs=5){
        (file_exists($dataFile)&&count(file($dataFile))>0)?$this->totalRecs=array_reverse(file($dataFile)):die('Data file not valid.');
        // validate number of records per page
        (is_int($numRecs)&&$numRecs>0)?$this->numRecs=$numRecs:die('Invalid number of records'.$numRecs);
    }
    public function displayRecords($getIndex){
        $page=isset($_GET[$getIndex])?$_GET[$getIndex]:0;
        // calculate number of pages
        $numPages=ceil(count($this->totalRecs)/$this->numRecs);
        // validate page pointer
        if(!preg_match("/^\d{1,2}$/",$page)||$page<1||$page>$numPages){
            $page=1;
        }
        // retrieve corresponding records from flat file
        $records=array_slice($this->totalRecs,($page-1)*$this->numRecs,$this->numRecs);
        foreach($records as $row){
            $columns=explode('|',$row);
            foreach($columns as $column){
                    $this->output.=$column.'';
            }
            $this->output.='
';
        }

        // create previous link
        if($page>1){
            $this->output.='[url="'.$_SERVER['PHP_SELF'].'?page='.($page-1).'"]&lt;&lt;Previous[/url]';
        }
        // create intermediate links
        for($i=1;$i<=$numPages;$i++){
            ($i!=$page)?$this->output.='[url="'.$_SERVER['PHP_SELF'].'?page='.$i.'"]'.$i.'[/url]':$this->output.=$i.'';
        }
        // create next link
        if($page<$numPages){
            $this->output.='[url="'.$_SERVER['PHP_SELF'].'?page='.($page+1).'"]Next&gt;&gt;[/url] ';
        }
        // return final output
        return $this->output;
    }
}
$paging = new Pager('data.dat');
echo $paging->displayRecords('page');
?>

il file data.dat

Chariots of fire|Vangelis
Friends of Mr. Cairo|Vangelis
Lucifer|The Alan Parson Project
The eye in the sky|Alan Parson Project
Caribean Blue|Enya
Only Time|Enya
Music|John Miles
The turn of a friendly card|The Alan Parson Project
Children|Robert Miles
One and One|Robert Miles
Sadness|Enigma
Mea Culpa|Enigma
Cherry Blossom Girl|Air
Hot stuff|Donna Summer
Bad Girls|Donna Summer
I will survive|Gloria Gaynor
Rimes and reasons|John Denver
Touch and go|Emerson,Lake and Powell
In Jeopardy|Roger Hogdson
Ameno|Era 

Il workhorse è la funzione array_slice