hi all,
i need help for the following
i upload a file to www.yousendit.com (http://www.yousendit.com) and it will generate a link to the file.the site allows 20 downloads of the file before the link expired
how to write simple codes to check if the link still exist anot? Hopefully this function should be what you want. Let me know if it doesn't work cos I wrote it a 1am in the morning ;)
<?php
/*
* Returns the status of an HTTP URL
*
* Returns the status of the URL supplied. If the URL is valid
* returning:
*
* true : the URL has been found on the server
* false : the URL has not been found on the server and
* a 404 response was returned by the server
* -1 : host name not found
* -2 : connection error (error notice produced)
* -3 : the URL has been moved to a new location
* -4 : other HTTP response (error notice produced)
* -5 : unknown response (error notice produced)
*
* @author Adam Delves <adam at sccode dot com>
* @param string url fully qualified url
* @return integer status
*/
function url_exists($url)
{
$url_info = parse_url($url);
if (! isset($url_info['host'])) {
return false;
}
$port = (isset($url_info['post'])?$url_info['port']:80);
if (! $hwnd = @fsockopen($url_info['host'], $port, $errno, $errstr)) {
if ($errno == 97) { /* invalid hostname DNS error */
return -1;
} else {
trigger_error("Connection faliure: '$errno' $errstr");
return -2;
}
}
$uri = @$url_info['path'] . '?' . @$url_info['query'];
$http = "HEAD $uri HTTP/1.1\r\n";
$http .= "Host: {$url_info['host']}\r\n";
$http .= "Connection: close\r\n\r\n";
@fwrite($hwnd, $http);
$response = fgets($hwnd);
$response_match = "/^HTTP\/1\.1 ([0-9]+) (.*)$/";
fclose($hwnd);
if (preg_match($response_match, $response, $matches)) {
if ($matches[1] == 404) { /* not found response */
return false;
} else if ($matches[1] == 200) { /* found */
return true;
} else if (preg_match("/^30[0-9]$/", $matches[1])) { /* found somewhere else */
return -3;
} else {
trigger_error("HTTP Response: '{$mathes[1]}' {$matches[2]}");
return -4;
}
} else {
trigger_error("Bad response: $response");
return - 5;
}
}
?>