Web

Check if a URL exists/is online

Function to check if a URL is online/exists. function is_valid_url($url){    $url = @parse_url($url);    if (!$url)    {        return false;    }    $url = array_map(‘trim’, $url);    $url[‘port’] = (!isset($url[‘port’])) ? 80 : (int)$url[‘port’];    $path = (isset($url[‘path’])) ? $url[‘path’] : ”;    if ($path == ”)    {   […]

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Network

Verifying DNS mappings

An improperly configured DNS setup can be really annoying. You want to make sure that your mappings work both ways: Each hostname should resolve to an address, and that address ought to resolve back to the proper hostname. If an address on your subnet(s) has been assigned a reverse pointer to a hostname, that hostname […]

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