<?php
print get_php_net();
define ('CACHEFILE', '/tmp/' . md5('php.net') . '_sh');
define ('CACHETIME', 180); // time to expiry, in secs
function
get_php_net ()
{
$st = @stat (CACHEFILE);
if ($st === false) { // fallthrough and download it
return download_url ();
}
if (CACHETIME < (time() - $st['mtime'])) {
return get_cached_data ();
}
return download_url ();
}
function
download_url ()
{
$data = implode ('', file ('http://www.php.net/'));
// write the new url
$fp = fopen (CACHEFILE, 'w');
if (!$fp) {
die ('Cannot open cache file for write access');
}
flock ($fp, LOCK_EX);
fwrite ($fp, $data);
flock ($fp, LOCK_UN);
fclose ($fp);
// return the website
return $data;
}
function
get_cached_data ()
{
return implode ('', file (CACHEFILE));
}
?>
