Pls poraďte...

if(file_exists("pages/" . $page . ".txt")) {
$page = $_GET["id"];
$fp = fopen("pages/" . $page . ".txt", "r+");
$data = fread($fp, filesize("pages/" . $page . ".txt"));
echo $page;
fclose($fp);
} else {
echo "zadana stranka neexistuje";
}

<?php   

$page = $_GET["id"];
if(file_exists("pages/" . $page . ".txt")) {
$fp = fopen("pages/" . $page . ".txt", "r+");
$data = fread($fp, filesize("pages/" . $page . ".txt"));
echo $page;
fclose($fp);
} else {
echo  "Article doesn't exist!";
}

?>

Warning: fopen(pages/1.txt) [function.fopen]: failed to open stream: Permission denied in /home/free/yw.sk/e/editor/root/www/articles.php on line 42

Warning: fread(): supplied argument is not a valid stream resource in /home/free/yw.sk/e/editor/root/www/articles.php on line 43
1
Warning: fclose(): supplied argument is not a valid stream resource in /home/free/yw.sk/e/editor/root/www/articles.php on line 45

<?php
$page = $_GET['id'];
if(file_exist($page)){
include("pages/$page.txt")
}
else
{
echo "Chyba";
}
?>

<?php
$page = $_GET['id'];
$file = "pages/".$page.".txt";
if(file_exist($file)){
include($file);
}
else
{
echo "Chyba";
}
?>

<?php
$page = $_GET['id'];
if(file_exist ($page)){
include("pages/$page.txt")
}
else
{
echo "Chyba";
}
?>      
   

Fatal error: Call to undefined function file_exist()

exist

exists

<?php
$page = $_GET['id'];
$file = "pages/".$page.".txt";
if(file_exists($file)){
include($file);
}
else
{
echo "Chyba";
}
?>