<?php 
 $filesperpage=30;
$i=0;
$page=isset($_GET['p'])?$_GET['p']:1;
$Results = glob("img/*.{txt}", GLOB_BRACE);
natsort( $Results );
$Results = array_reverse($Results);
foreach ($Results as $filename) {

 if ($i>=($page-1)*$filesperpage and $i<$page*$filesperpage) {

require "$filename";
 
}
	$i++; 
}
?>

http://php.net/manual/ru/function.pathinfo.php

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