function find_my_page()
{
// get the name of the 'missing' file
$page = basename($_SERVER['REDIRECT_URL']);
// used to pick the correct dictionary
$dir = dirname($_SERVER['REDIRECT_URL']);
$key = md5($dir);
// load spelling dictionaries
$ps = pspell_config_create("en");
pspell_config_personal($ps, "./{$key}.pws");
$pl = pspell_new_config($ps);
// find alternatives
$alt = pspell_suggest($pl, $page);
if (!$alt) {
// no matches, no choice but to show site map
display_site_map();
return;
}
// escape data for sqlite
foreach ($alt as $key => $file) {
$alt[$key] = sqlite_escape_string($file);
}
// fetch all matching pages;
$db = new sqlite_db("./typos.sqlite");
$alt = $db->single_query("SELECT url FROM typo WHERE key IN('" . implode("','", $alt) . "')");
switch (@count($alt)) {
case 1:
// if only one suggestion is avaliable redirect the user to that page
header("Location: {$alt[0]}");
return;
break;
case 0:
// no matches, no choice but to show site map
display_site_map();
break;
default:
// show the user possible alternatives if >1 is found
echo "The page you requested, '{$_SERVER['REDIRECT_URL']}' cannot be found.<br />\nDid you mean:\n";
foreach ($alt as $url) {
echo " <a href='{$url}'>{$url}</a><br />\n";
}
}
}
// determine the extension of the not found page.
$extension = strtolower(substr(strrchr($_SERVER['REDIRECT_URL'], '.'), 1));
// actual error handling
switch ($extension) {
case 'php':
case 'cgi':
four_oh_four_handler('DYNAMIC', 1);
// Display a site map to the user so that
// they can find the page they are looking for.
display_site_map();
break;
case 'html':
case 'htm':
case 'shtml':
four_oh_four_handler('STATIC', 2);
display_site_map();
break;
case 'jpg':
case 'gif':
case 'png':
four_oh_four_handler('IMAGE', 3);
// to prevent ugly broken image
// redirect the request to a blank pixel image.
header("Location: /blank.gif");
return;
break;
default:
four_oh_four_handler('UNKNOWN', 4);
display_site_map();
break;
}
