Re: Upload alert
| From: | Miguel Cruz | Date: | Mon, 08 Apr 2002 17:45:05 +0000 |
| Subject: | Re: Upload alert | ||
| References: | 1 | Groups: | php.general |
| Request: | Send a blank email to php-general+get-92092@lists.php.net to get a copy of this message | ||
On Mon, 8 Apr 2002, Rodolfo Silva wrote:
> I need a php script to alert me (with a pop up window or something like
> that) when a certain web page is modified. Is it possible? Where can I
> find that?
I don't know where you can find it pre-made, but it's pretty simple. In a
nutshell:
$checksum = md5(implode('', file('http://www.whatever.org/')));
That'll give you a 32-character string.
Save $checksum in a database or in a local file.
Repeat as often as you need to (using cron or whatever). Compare the new
value against the one you saved. If they don't match, the page changed.
NB: This will catch ANY change in the page. If that page is set up to show
the current date, for instance, then that will be picked up as a change
every day. If you need to deal with something like this, you're going to
have to analyze and parse the page.
miguel